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| LMBR1 | Limb region 1 protein homolog; Putative membrane receptor. (490 aa) | ||||
| RNF32 | RING finger protein 32; May play a role in sperm formation. (362 aa) | ||||
| ZP2 | Processed zona pellucida sperm-binding protein 2; Component of the zona pellucida, an extracellular matrix surrounding oocytes which mediates sperm binding, induction of the acrosome reaction and prevents post-fertilization polyspermy. The zona pellucida is composed of 3 to 4 glycoproteins, ZP1, ZP2, ZP3, and ZP4. ZP2 may act as a secondary sperm receptor. (745 aa) | ||||