Fertilizin receptor proteins necessary for attraction of sperms to...

Fertilizin is a glycoprotein that acts as a sperm receptor. In mammals, these receptor proteins (such as ZP3) are present on the zona pellucida, which is the thick, transparent, extracellular layer surrounding the mammalian ovum. The interaction between fertilizin on the zona pellucida and antifertilizin on the sperm ensures species-specific fertilization.

Answer: zona pellucida