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High-resolution NMR structures of hIAPP1–19 in the absence (left) and in the presence (right) of 10 mM ZnCl2. Zinc binding induces ordering of the secondary structure at the N-terminus. In the absence of zinc, Gln 10, Asn 14, His 18 are oriented in same plane whereas Asn 14 and His 18 are in the same plane with the His 18 ring flipped horizontally while Gln 10 is moved closer to the N-terminus.
