müllerian gamete generation vitellogenesis http://id.loc.gov/authorities/subjects/sh2008001263 http://purl.bioontology.org/ontology/MESH/D014818 http://purl.obolibrary.org/obo/GO_0007296 https://en.wikipedia.org/wiki/Vitellogenesis https://www.wikidata.org/wiki/Q7937033 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. The production of yolk. Yolk is a mixture of materials used for embryonic nutrition. yolk deposition yolk formation yolk production