The mammalian zona pellucida, which mediates species- specific sperm binding, induction of the acrosome reaction and prevents post-fertilization polyspermy, is composed of three to four glycoproteins, ZP1, ZP2, ZP3, and ZP4. ZP1 ensures the structural integrity of the zona pellucida. Processed zona pellucida sperm-binding protein 1 617 Zp1 ZP1_RAT Zona pellucida glycoprotein 1 Zona pellucida sperm-binding protein 1 MAWGCFVVLLLLVAAPLRLGQHLHLKPGFQYSYDCGVQGMQLLVFPRPNQTIQFKVLDEFGNRFEVNNCSICYHWVISEAQKPAVFSADYKGCHVLEKQDGRFHLRVFIQAVLPNGRVDTAQDVTLICPKPDHILTPESYLAPPTTPQPFIPHTFALHPISGHTLAGSGHTGLTTLYPETHPTPAPPSSEPGPVGPTVPQSQWGTLGSWELTELDSIGTHLLQERCQVASGHIPCMVKGSSEEACQQAGCCYDNTKEMPCYYGNTVTLQCFRSGYFTLVMSQETALTHGVMLDNVHLAYAPNGCPPTQKTSAFVVFHVPLTLCGTAIQVVGKQLVYENQLVSNIEVQTGPQGSITRDGVFRLHVRCIFNASDFLPIRASIFSPQPPAPVTRSGPLRLELRIATDKTFSSYYQGSDYPLVRLLQEPVYIEVRLLQRTDPGLALMLHQCWATPSASPFEQPQWPILSDGCPFKGDNYRTQMVAADRATLPFWSHYQRFTIATFTLLDSSSQNALRGQVYFFCSASACHPVGSETCSTTCDSEIARHRRSSGHHNSTIRALDIVSSPGAVGFEDAPKLEPSGSTRNSGSRPLLWVLQLLALTLVLGDGVLVGLSWAWAWA