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Electron density for antiparallel β-strands 8–11 in the central sheet of OspA. The (2Fobs − Fcalc), model phase map is contoured at 1.0 σ (mesh). The thick-wire model extends from Thr-108 at the upper left through two β-hairpins to Ser-152 at the upper right. Note poor density for the flexible loop (upper center) between β-strands 9 and 10, typical for the larger more-flexible loops on the upper edge of the central sheet.
