1ws7 is a 4 chain structure with sequence from Cucurbita pepo. Full crystallographic information is available from OCA.
Reference
Xie Y, Inoue T, Miyamoto Y, Matsumura H, Kataoka K, Yamaguchi K, Nojini M, Suzuki S, Kai Y. Structural reorganization of the copper binding site involving Thr15 of mavicyanin from Cucurbita pepo medullosa (zucchini) upon reduction. J Biochem. 2005 Apr;137(4):455-61. PMID:15858169 doi:137/4/455
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