5IIB:
reference: Structural Basis of Egg Coat-Sperm Recognition at Fertilization., Raj I, Sadat Al Hosseini H, Dioguardi E, Nishimura K, Han L, Villa A, de Sanctis D, Jovine L, Cell. 2017 Jun 15;169(7):1315-1326.e17. doi: 10.1016/j.cell.2017.05.033. PMID: 28622512

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