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Crystal structures of 2F5 Fab′ in complex with peptides harboring β-turn stabilizing linkages between positions 663 and 667 of the MPER. The reference peptide ELDKWAS is shown in light gray, whereas peptides ECDKWCS (A), ENDKW(Dap)S (B), EQDKW(Dap)S (C), and E(Dap)DKWQS (D) are shown in green. A white rendering of the 2F5 Fab′ paratope surface is shown in the background.
