The Ontogenetic Osteohistology of Tenontosaurus tilletti
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{"title"=>"The ontogenetic osteohistology of tenontosaurus tilletti", "type"=>"journal", "authors"=>[{"first_name"=>"Sarah", "last_name"=>"Werning", "scopus_author_id"=>"23480601700"}], "year"=>2012, "source"=>"PLoS ONE", "identifiers"=>{"doi"=>"10.1371/journal.pone.0033539", "scopus"=>"2-s2.0-84859046666", "pui"=>"364528374", "isbn"=>"1932-6203", "pmid"=>"22470454", "issn"=>"19326203", "sgr"=>"84859046666"}, "id"=>"242f9454-d502-3628-884c-6f4770652366", "abstract"=>"Tenontosaurus tilletti is an ornithopod dinosaur known from the Early Cretaceous (Aptian-Albian) Cloverly and Antlers formations of the Western United States. It is represented by a large number of specimens spanning a number of ontogenetic stages, and these specimens have been collected across a wide geographic range (from central Montana to southern Oklahoma). Here I describe the long bone histology of T. tilletti and discuss histological variation at the individual, ontogenetic and geographic levels. The ontogenetic pattern of bone histology in T. tilletti is similar to that of other dinosaurs, reflecting extremely rapid growth early in life, and sustained rapid growth through sub-adult ontogeny. But unlike other iguanodontians, this dinosaur shows an extended multi-year period of slow growth as skeletal maturity approached. Evidence of termination of growth (e.g., an external fundamental system) is observed in only the largest individuals, although other histological signals in only slightly smaller specimens suggest a substantial slowing of growth later in life. Histological differences in the amount of remodeling and the number of lines of arrested growth varied among elements within individuals, but bone histology was conservative across sampled individuals of the species, despite known paleoenvironmental differences between the Antlers and Cloverly formations. The bone histology of T. tilletti indicates a much slower growth trajectory than observed for other iguanodontians (e.g., hadrosaurids), suggesting that those taxa reached much larger sizes than Tenontosaurus in a shorter time.", "link"=>"http://www.mendeley.com/research/ontogenetic-osteohistology-tenontosaurus-tilletti", "reader_count"=>49, "reader_count_by_academic_status"=>{"Professor > Associate Professor"=>3, "Researcher"=>11, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>5, "Student > Master"=>5, "Other"=>4, "Student > Bachelor"=>10, "Lecturer"=>1, "Professor"=>1}, "reader_count_by_user_role"=>{"Professor > Associate Professor"=>3, "Researcher"=>11, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>5, "Student > Master"=>5, "Other"=>4, "Student > Bachelor"=>10, "Lecturer"=>1, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Engineering"=>1, "Environmental Science"=>1, "Mathematics"=>1, "Agricultural and Biological Sciences"=>16, "Medicine and Dentistry"=>1, "Physics and Astronomy"=>2, "Earth and Planetary Sciences"=>24}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Physics and Astronomy"=>{"Physics and Astronomy"=>2}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>24}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>16}, "Mathematics"=>{"Mathematics"=>1}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>1}}, "reader_count_by_country"=>{"Canada"=>1, "Argentina"=>1, "United States"=>1, "United Kingdom"=>2, "Chile"=>2, "Portugal"=>1, "Spain"=>2}, "group_count"=>3}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/661769"], "description"=>"<p>This tree is pruned from recently published estimations of ornithischian <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033539#pone.0033539-Butler1\" target=\"_blank\">[14]</a> and ornithopod <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033539#pone.0033539-McDonald1\" target=\"_blank\">[15]</a>, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033539#pone.0033539-PrietoMrquez1\" target=\"_blank\">[82]</a> dinosaurs. These studies do not conflict in their assessment of relationships of these taxa. Node numbers correspond to the following clades: 1 – Ornithopoda, 2 – Iguanodontia, 3 – Ankylopollexia, 4 – Hadrosauroidea, 5 – Hadrosauridae. Femoral lengths are taken from <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033539#pone.0033539-Carrano1\" target=\"_blank\">[81]</a>, except <i>Zalmoxes </i><a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033539#pone.0033539-Weishampel2\" target=\"_blank\">[83]</a> and <i>Maiasaura </i><a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033539#pone.0033539-Horner2\" target=\"_blank\">[17]</a>.</p>", "links"=>[], "tags"=>["relationships", "femoral", "lengths", "ornithopod", "taxa", "discussed"], "article_id"=>332260, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g001"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Phylogenetic_relationships_and_adult_femoral_lengths_mm_of_ornithopod_taxa_discussed_in_this_study_/332260", "title"=>"Phylogenetic relationships and adult femoral lengths (mm) of ornithopod taxa discussed in this study.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:13:33"}
  • {"files"=>["https://ndownloader.figshare.com/files/661882"], "description"=>"<p><b>A.</b> Cross-section of OMNH 10144. This bone was invaded by bacteria before fossilization and thus much of the primary tissue is obscured. It is presented here in cross-section to illustrate vascular density and arrangement. <b>B.</b> Detail of A, showing general vascular patterning. The cortex is dominated by longitudinal canals arranged circumferentially. <b>C.</b> Cross-section of OMNH 8137. <b>D.</b> Detail of C, showing primary cortical tissues. The bone is woven, and most canals are longitudinal primary osteons (some anastomose circumferentially). Two LAGs (arrows) are shown. <b>E.</b> Cross-section of FMNH PR2261. <b>F.</b> Detail of E, showing mostly primary tissues of the midcortex at a transition to slower growth. Deeper in the cortex (upper left), bone is woven and osteocytes are dense and disorganized. Some secondary osteons are visible, but they do not overlap or obscure all of the primary tissues. Past the LAG (arrow), canals remain dense but decrease in diameter, bone tissue is weakly woven, and osteocytes decrease in number and become more organized. Scale bars: A = 2 mm; B, F = 1 mm; C = 4 mm; D = 0.5 mm; E = 10 mm.</p>", "links"=>[], "tags"=>["mid-diaphyseal", "humerus", "juvenile", "subadult"], "article_id"=>332374, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g002"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_mid_diaphyseal_humerus_of_Tenontosaurus_in_a_juvenile_A_B_subadult_C_D_and_adult_E_F_/332374", "title"=>"Osteohistology of the mid-diaphyseal humerus of <i>Tenontosaurus</i> in a juvenile (A, B), subadult (C, D) and adult (E, F).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:14:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/662095"], "description"=>"<p><b>A.</b> Cross-section of OMNH 10144. This bone was invaded by bacteria before fossilization and thus much of the primary tissue is obscured. It is presented here in cross-section to illustrate vascular density and arrangement. <b>B.</b> Detail of A, showing general vascular patterning. The cortex is dominated by longitudinal canals arranged radially. <b>C.</b> Cross-section of OMNH 2531. <b>D.</b> Detail of the midcortex of C, showing primary cortical tissues. Longitudinal primary osteons are visible in primary woven bone tissue. One LAG (arrow) is shown. <b>E.</b> Detail of the periosteal region of C, showing the surface condition in ulnae that lack the middiaphyseal rugosity. Longitudinal primary osteons are visible in primary woven bone tissue, very similar to the tissue of the midcortex. <b>F.</b> Cross-section of OMNH 34191. <b>G.</b> Detail of the midcortex of F, showing primary cortical tissues. Midcortical tissues are similar to those shown in OMNH 2531. One LAG (arrow) is shown. <b>H.</b> Detail of the periosteal region of F, showing the periosteal condition in ulnae with a rugosity on the posterior surface of the bone at midshaft. The histology of this rugosity is a strongly woven, high vascularized, and very disorganized tissue that builds along a surface similar to that seen in E (yellow arrows). It grades laterally into and is capped by more typical primary bone tissue identical to that of the rest of the cortex. Scale bars: A = 2 mm; B = 1 mm; C,F = 4 mm; D,E,G = 0.5 mm; H = 2 mm.</p>", "links"=>[], "tags"=>["mid-diaphyseal", "ulna", "juvenile", "subadults"], "article_id"=>332591, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g003"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_mid_diaphyseal_ulna_of_Tenontosaurus_in_a_juvenile_A_B_and_two_subadults_C_E_F_H_/332591", "title"=>"Osteohistology of the mid-diaphyseal ulna of <i>Tenontosaurus</i> in a juvenile (A, B) and two subadults (C–E, F–H).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:15:27"}
  • {"files"=>["https://ndownloader.figshare.com/files/662299"], "description"=>"<p><b>A.</b> Cross-section of FMNH PR 2261. <b>B.</b> Detail of A, showing primary and secondary tissues of the mid- and outer cortex. The midcortex experiences dense secondary remodeling, and the outer cortex shows longitudinal primary osteons in parallel-fibered bone tissues grading into longitudinal simple canals in lamellar bone. Seven LAGs (arrows) are shown. <b>C.</b> Detail of OMNH 62990 (no cross-section shown), illustrating the radial arrangement of longitudinal primary osteons in an unremodeled area of the midcortex. One LAG (arrow) is shown. Periosteal surface to the top of this image. Scale bars: A = 4 mm; B,C = 1 mm.</p>", "links"=>[], "tags"=>["mid-diaphyseal", "ulna"], "article_id"=>332794, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g004"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_mid_diaphyseal_ulna_of_Tenontosaurus_in_two_adults_/332794", "title"=>"Osteohistology of the mid-diaphyseal ulna of <i>Tenontosaurus</i> in two adults.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:16:33"}
  • {"files"=>["https://ndownloader.figshare.com/files/662503"], "description"=>"<p><b>A.</b> Cross-section of MOR 679. This section is slightly more proximal compared to others in this sample and shows part of the fourth trochanter. <b>B.</b> Detail of the outer cortex of A, showing primary cortical tissues. Longitudinal primary osteons in woven bone do not show many anastomoses. <b>C.</b> Cross-section of OMNH 34785 at the mid-diaphysis. <b>D.</b> Detail of the periosteal surface of C, showing longitudinal primary osteons and simple canals. Some canals open to the surface of the bone, but this is rare around the entire surface. Scale bars: A,C = 4 mm; B,D = 0.5 mm.</p>", "links"=>[], "tags"=>["diaphyseal", "femur"], "article_id"=>333001, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g005"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_diaphyseal_femur_of_Tenontosaurus_in_two_juveniles_/333001", "title"=>"Osteohistology of the diaphyseal femur of <i>Tenontosaurus</i> in two juveniles.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:17:35"}
  • {"files"=>["https://ndownloader.figshare.com/files/662684"], "description"=>"<p><b>A.</b> Cross-section of OMNH 34784. <b>B.</b> Detail of A, showing the primary cortical tissues of the cortex. Longitudinal primary osteons begin to form circumferential anastomoses in the woven bone tissues of the inner and midcortex. <b>C.</b> Partial cross-section of FMNH PR2261. <b>D.</b> Detail of C, showing the tissues of the periosteal region. Longitudinal primary osteons and simple canals are not as dense as in the midcortex and anastomose less frequently moving periosteally. Tissue is lamellar. Five LAGs (arrows) are shown. <b>E.</b> Detail of a radial transect through the cortex of C. Image taken through waveplate polarizing filters (crossed Nicols). Dense secondary remodeling is visible into the midcortex and zones of decreasing width are visible. Ten LAGs (arrows) are shown. Scale bars: A,C = 5 mm; B,D = 0.5 mm; E = 1 mm.</p>", "links"=>[], "tags"=>["mid-diaphyseal", "femur", "subadult"], "article_id"=>333181, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g006"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_mid_diaphyseal_femur_of_Tenontosaurus_in_a_subadult_A_B_and_adult_C_E_/333181", "title"=>"Osteohistology of the mid-diaphyseal femur of <i>Tenontosaurus</i> in a subadult (A,B) and adult (C–E).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:18:28"}
  • {"files"=>["https://ndownloader.figshare.com/files/662919"], "description"=>"<p><b>A.</b> Cross-section of MOR 788. <b>B.</b> Detail of the primary cortical tissues of A. Longitudinal simple canals and primary osteons have wide diameters compared to those of older ontogenetic age. Bone tissue is woven-fibered. <b>C.</b> Cross-section of OMNH 10144. This bone was invaded by bacteria before fossilization and thus much of the primary tissue is obscured. It is presented here in cross-section to illustrate vascular density and arrangement. <b>D.</b> Detail of the endosteal region of C, showing lamellar tissues (to right of image). Canals are narrower in diameter compared to the perinate (B). <b>E.</b> Detail of the periosteal region of C showing primary cortical tissues. The longitudinal primary osteons are surrounded by woven bone tissue. <b>F.</b> Cross-section of OMNH 63525. <b>G.</b> Detail of the midcortex of F. Longitudinal primary osteons run through woven bone tissue and show short circumferential anastomoses. One LAG (arrow) is shown. Scale bars: A,C = 2 mm; B,D,E,G = 0.5 mm; F = 5 mm.</p>", "links"=>[], "tags"=>["mid-diaphyseal", "tibia", "perinate", "juvenile", "subadult"], "article_id"=>333412, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g007"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_mid_diaphyseal_tibia_of_Tenontosaurus_in_a_perinate_A_B_juvenile_C_D_and_subadult_F_G_/333412", "title"=>"Osteohistology of the mid-diaphyseal tibia of <i>Tenontosaurus</i> in a perinate (A,B), juvenile (C,D), and subadult (F,G).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:19:40"}
  • {"files"=>["https://ndownloader.figshare.com/files/663123"], "description"=>"<p><b>A.</b> Cross-section of OMNH 34784. <b>B.</b> Detail of the inner cortex of A showing the endosteal surface and medullary bone (egg-laying) tissue. The primary cortical tissue (left side) consists of woven bone vascularized by longitudinal primary osteons connected by moderately long circumferential anastomoses. This tissue is beginning to undergo secondary remodeling. Endosteal lamellae separate the cortical bone from the medullary bone tissue, which radiates inward into the medullary cavity. <b>C.</b> Cross-section of FMNH PR 2261. This specimen was treated with oil before photography to increase light penetration, but this reduces the appearance of some thin, mineralized structures (LAGs, cement lines). <b>D.</b> Detail of C, showing histology of the inner cortex. Secondary osteons are abundant and obscure much of the primary cortical tissue. <b>E.</b> Detail of C, showing the outer cortex. Osteocytes are dense throughout the cortex, despite the transition to parallel-fibered bone in this region. Canals of the outermost cortex anastomose less frequently compared to the inner cortex. Scale bars: A = 5 mm; B,D,E = 0.5 mm; C = 10 mm.</p>", "links"=>[], "tags"=>["mid-diaphyseal", "tibia", "subadult"], "article_id"=>333612, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g008"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_mid_diaphyseal_tibia_of_Tenontosaurus_in_a_subadult_A_B_and_an_adult_C_D_E_/333612", "title"=>"Osteohistology of the mid-diaphyseal tibia of <i>Tenontosaurus</i> in a subadult (A,B) and an adult (C,D,E).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:20:47"}
  • {"files"=>["https://ndownloader.figshare.com/files/663332"], "description"=>"<p>The cross-sectional geometry of the fibula changes from round to a flattened oval ontogenetically. <b>A.</b> Cross-section of OMNH 34785. This bone was invaded by bacteria before fossilization and thus much of the primary tissue is obscured. It is presented here in cross-section to illustrate vascular density and arrangement. <b>B.</b> Detail of the periosteal region of A. Longitudinal primary osteons and simple canals are visible in the periosteal region, but they do not show high levels of vascular connectivity.. The bone tissue is woven. <b>C.</b> Cross-section of OMNH 34783. This specimen was treated with oil before photography to increase light penetration, but this reduces the appearance of some thin, mineralized structures (LAGs, cement lines). <b>D.</b> Detail of the midcortex of C, showing the primary tissue of the midcortex. Most canals are longitudinal primary osteons which may show short anastomoses with one or two other canals. One secondary osteon is visible at the top of this image. A single LAG (arrow) is shown. <b>E.</b> Cross-section of OMNH 16563. <b>F.</b> Detail of the midcortex of E. As in D, canals are mostly longitudinal primary osteons. The weakly-woven bone is easier to ascertain in this image, based on the level of osteocyte disorganization. Scale bars: A = 2 mm; B,D,F = 0.5 mm; C,E = 5 mm.</p>", "links"=>[], "tags"=>["mid-diaphyseal", "fibula", "juvenile", "subadults"], "article_id"=>333825, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.g009"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Osteohistology_of_the_mid_diaphyseal_fibula_of_Tenontosaurus_in_a_juvenile_A_B_and_two_subadults_C_F_/333825", "title"=>"Osteohistology of the mid-diaphyseal fibula of <i>Tenontosaurus</i> in a juvenile (A,B) and two subadults (C–F).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 07:21:51"}
  • {"files"=>["https://ndownloader.figshare.com/files/663494"], "description"=>"<p>Specimens indicated with an asterisk were histologically sampled as part of a previous study <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033539#pone.0033539-Horner2\" target=\"_blank\">[17]</a>, but were re-examined and re-imaged for this project.</p>", "links"=>[], "tags"=>["specimens", "sampled", "examined"], "article_id"=>333989, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.t001"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_List_of_Tenontosaurus_specimens_sampled_and_examined_for_this_study_/333989", "title"=>"List of <i>Tenontosaurus</i> specimens sampled and examined for this study.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-20 07:22:37"}
  • {"files"=>["https://ndownloader.figshare.com/files/663526"], "description"=>"<p>For each element, all sectioned specimens are listed in size order (in the order discussed in the text). All measurements are in millimeters. Abbreviations: ACT average cortical thickness, MajA major axis diameter, MCmaj medullary cavity diameter along the major axis, MCmin medullary cavity diameter along the minor axis, MinA minor axis diameter.</p>", "links"=>[], "tags"=>["cortex", "medullary", "cavity", "cross-sections", "examined"], "article_id"=>334014, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.t003"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Measurements_of_the_cortex_and_medullary_cavity_for_the_cross_sections_examined_in_this_study_/334014", "title"=>"Measurements of the cortex and medullary cavity for the cross-sections examined in this study.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-20 07:22:46"}
  • {"files"=>["https://ndownloader.figshare.com/files/663555"], "description"=>"<p>For each specimen, the first number listed is a full cross-section, and any subsequent numbers are detailed images of one part of that closeup. Abbreviations: A adult, J juvenile, P perinate, SA subadult.</p>", "links"=>[], "tags"=>["accession", "numbers", "high-resolution", "images", "slides"], "article_id"=>334045, "categories"=>["Physiology", "Evolutionary Biology"], "users"=>["Sarah Werning"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0033539.t002"], "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_MorphoBank_accession_numbers_of_the_high_resolution_images_for_the_slides_used_in_this_study_/334045", "title"=>"MorphoBank accession numbers of the high-resolution images for the slides used in this study.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-20 07:22:55"}

PMC Usage Stats | Further Information

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Relative Metric

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