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. 2019 Jul 10;9:9978. doi: 10.1038/s41598-019-46444-w

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a–f) Comparison of density of collagen fibril packing in cross-section in age-matched HERDA vs. control horse MDBs and abnormal collagen fibril orientation in the MDBs of HERDA horses imaged with TEM. 5a = Three-year-old HERDA horse gelding with loosely packed collagen fibrils, mild variation in fibril size, variation in fibril shape, and granulo-filamentous deposits in the interfibrillar space. 5b = Two-year-old control Quarter Horse mare with densely packed collagen fibrils and variation in fibril size. 5c = Whirling collagen fibrils in a 3-year-old gelding. 5d = Hook shaped () and fragments of () collagen fibrils, as well as loosely packed collagen fibrils in a 6-year-old mare. 5e = Granulo-filamentous deposits () in the interfibrillar space, as well as loosely packed collagen fibrils in a 3-year-old gelding. 5 f = Fragmented () and loosely packed collagen fibrils in a 2-year-old gelding.

Inline graphic — (a–f) Comparison of density of collagen fibril packing in cross-section in age-matched HERDA vs. control horse MDBs and abnormal collagen fibril orientation in the MDBs of HERDA horses imaged with TEM. 5a = Three-year-old HERDA horse gelding with loosely packed collagen fibrils, mild variation in fibril size, variation in fibril shape, and granulo-filamentous deposits in the interfibrillar space. 5b = Two-year-old control Quarter Horse mare with densely packed collagen fibrils and variation in fibril size. 5c = Whirling collagen fibrils in a 3-year-old gelding. 5d = Hook shaped () and fragments of () collagen fibrils, as well as loosely packed collagen fibrils in a 6-year-old mare. 5e = Granulo-filamentous deposits () in the interfibrillar space, as well as loosely packed collagen fibrils in a 3-year-old gelding. 5 f = Fragmented () and loosely packed collagen fibrils in a 2-year-old gelding.