2hnv is a 5 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA.
Reference
Li X, Lee H, Wu J, Breslow E. Contributions of the interdomain loop, amino terminus, and subunit interface to the ligand-facilitated dimerization of neurophysin: crystal structures and mutation studies of bovine neurophysin-I. Protein Sci. 2007 Jan;16(1):52-68. PMID:17192588 doi:16/1/52
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