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The secondary structure elements in CPGRP-S are shown. Five β-strands including β3, β4, β5, β6, and β7 are shown in red where β3, β4, β6, and β7 are in the parallel arrangement while β5 is oriented in an antiparallel sense. Three α-helices, α1, α2, and α3 are shown in grey. There are two short helices, η1 and η2 in yellow.
