“Fertilization, the fusion of sperm and oocyte to form a zygote, is the first and arguably the most important cell-cell interaction event in an organism’s life.” 150
150 Wilson, L.D., Obakpolor, O.A., Jones, A.M., Richie, A.L., Mieczkowski, B.D., Fall, G.T., Hall, R.W., Rumbley, J.N., and Kroft, T.L. The Caenorhabditis elegans spe-49 gene is required for fertilization and encodes a sperm-specific transmembrane protein homologous to SPE-42. Mol Reprod Dev. 2018 Jul;85(7):563-578, https://pubmed.ncbi.nlm.nih.gov/29693775.