Scientific Source #24 – Peer-Reviewed Article
“Activation of the egg by the sperm is the first, vital stage of embryogenesis”24
![](https://whendoeslifebegin.org/wp-content/uploads/2021/08/Scientific-Source-24-793x1024.png)
24Hachem, A., Godwin, J., Ruas, M., Lee, H.C., Ferrer Buitrago, M., Ardestani, G., Bassett, A., Fox, S., Navarrete, F., de Sutter, P., Heindryckx, B., Fissore, R., & Parrington J., PLCζ is the physiological trigger of the Ca2+ oscillations that induce embryogenesis in mammals but conception can occur in its absence, Development, 2017, 144(16):2914-2924, https://dev.biologists.org/content/144/16/2914.