1XY1:
reference: Crystal structure analysis of deamino-oxytocin: conformational flexibility and receptor binding., Wood SP, Tickle IJ, Treharne AM, Pitts JE, Mascarenhas Y, Li JY, Husain J, Cooper S, Blundell TL, Hruby VJ, et al., Science 1986 May 2;232(4750):633-6. PMID: 3008332

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