Triple-Helix Structure of Collagen 胶原蛋白

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Bella J, Collagen Structure: New Tricks from a Very Old Dog. Biochemical Journal, 473: 1001 (2016)
http://www.biochemj.org/content/473/8/1001.figures-only
(Figure 2's legend is below the figure. Fig 2(A)(B) and (C) are real, depicting, respectively, elements as balls, backbones, and ribbons (in the latter two, hydrogen bonds are green; in all three, the bottom shows the same viewed from top or bottom). In Fig 2(D), the green supergelix is imagined)

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