Nature 389, 455–462 (1997)

In a sentence on page 459 describing the orientation of the Gly-Pro-Arg-Pro-amide ligand as bound to the double-D fragment, the wrong aspartate was referred to on one occasion. The sentence should have read: “…the α-amino group being juxtaposed between the residues Aspγ364 and Aspγ330, and the guanidino group of the arginine lying between the carboxyl group of Aspγ330 and the carboxamide of Glnγ329 (Fig. 5a, b).”