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Figure 2
Molecular-surface representation of the papain active site showing the position of the catalytic Cys25 (yellow) and the two peptide fragments (sticks coloured C orange, O red, N blue) with associated omit difference electron-density (Fo − Fc) map contoured at 1.5σ (magenta).

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
Volume 62| Part 6| May 2006| Pages 504-508
doi:10.1107/S1744309106014849
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