1SPP:
reference: The crystal structures of two spermadhesins reveal the CUB domain fold., Romero A, Romao MJ, Varela PF, Kolln I, Dias JM, Carvalho AL, Sanz L, Topfer-Petersen E, Calvete JJ, Nat Struct Biol 1997 Oct;4(10):783-8. PMID: 9334740

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