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Bz-asn-gly-thr-nh2

(D-arg2)-kyotorphin

For-met-leu-pna

H-val-gly-asp-glu-oh

For-met-leu-phe-ome

H-met-arg-phe-oh

For-met-leu-tyr-oh

For-met-met-phe-oh