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Structure of the carboxyl-terminal domain of MecA (residues 121–218). A, overall structure of MecA-(121–218). The structure contains four α-helices and four antiparallel β-strands, which form a central β-sheet surrounded by α-helices. B, the four molecules of MecA-(121–218) in one asymmetric unit are structurally identical. C, the topology diagram of MecA-(121–218).
