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Figure 9
Ball-and-stick models of L-cystine at (a) ambient pressure and (b) 3.7 GPa as viewed down ([01\bar2]). The red planes are through the Cα atoms in each glycine-like layer running perpendicular to the c-axes of each plot. The overall compression of L-cystine caused via the `twisting' of the molecules can be seen in compression between the layers (A), and between pairs of layers (B). The distance between layers A and B reduces from 3.729 (2) to 3.539 (21) Å, and 5.597 (2) to 5.386 (22) Å from ambient to 3.7 GPa, respectively. The distance between the first and last adjacent pairs of layers for both the ambient and 3.7 GPa data sets is shown.

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