Vitellogenin is an egg yolk precursor protein expressed in the females of nearly all oviparous species including fish, amphibians, reptiles, birds, most invertebrates, and monotremes.
Vitellogenin is 'n eiergeel voorloper proteïen uitgedruk in die vroue van byna al ovipaar spesies insluitend visse, amfibieë, reptiele, voëls, die meeste invertebrate, en monotremes.