The sperm binds to the egg through another ligand reaction between receptors on the vitelline membrane. The sperm surface protein bindin, binds to a receptor on the vitelline membrane identified as EBR1.
the spErm biNds tO tHe egG tHRoUgH anOTHer ligAnd r.EactiON beTwEEN REceptoRS on ThE viTelline MEmbRaNE. tHe spERm surFAcE proTeiN biNdIn, bInDs to a rECeptor on ThE vIteLlInE membrAne identiFiED as Ebr1