Vitellogenesis

**Definition:** The active production and accumulation of VITELLINS (egg yolk proteins) in the non-mammalian OOCYTES from circulating precursors, VITELLOGENINS. Vitellogenesis usually begins after the first MEIOSIS and is regulated by estrogenic hormones.

**Tree numbers:** - G04.152.650.249.880 - G08.686.784.310.500.880