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Figure 2
Residual density maps (synchrotron data) in the planes of the six peptide bonds. Upper left to bottom right: D-Pro–Ala1, Ala1–Ala[_2], Ala[_2]–Ala3, Ala3–Ala[_4], Ala[_4]–L-Pro, L-Pro–D-Pro. Contour lines (full lines = positive, dotted = negative) are 0.1 e Å−3; zero line dashed. No resolution cut-off.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 58| Part 4| July 2002| Pages 721-727
doi:10.1107/S0108768102005839
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