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Representative structures of the (a) type II′ β-turn, (b) type II β-turn, and (c) 3–4 cis conformations. (d) Superimpositions of the three types of β-turns. The carbon atoms represented by green, cyan, and magenta correspond to the type II′, type II, and 3–4 cis conformations, respectively. The RMSDs among these conformations are listed in Table 2.
