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. 2016 Feb 25;11(2):e0149947. doi: 10.1371/journal.pone.0149947

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© 2016 He et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 1 — A: A monolayer of endothelial cell adhered to internal elastic membrane in 1-day old yak (arrowheads) (Massion trichrome). B: An integral structure of the left circumflex of coronary artery in 1-day old yak (Massion trichrome). C: Internal elastic membrane was disrupted in heart of 6-month old yak (arrowheads) (VVG). D: The internal elastic membrane was divided into two layers in 1-year old yak (arrowheads) (VVG). E: Those internal elastic membrane and smooth muscle cells together form Muscle elastic zone in 2-year old yak (arrowheads) (VVG). F: Secondary internal elastic membrane ruptured, or even fall off, and smooth muscle membrane exposed in old yak (arrowheads) (VVG).