Scientific Source #40 – Peer-Reviewed Article
“The life cycle of mammals begins when a sperm enters an egg.”40
40Okada, Y., Yamagata, K., Hong, K., Wakayama, T., & Zhang, I., A role for the elongator complex in zygotic paternal genome demethylation, Nature, 2010, 463(7280):554-8, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2834414.