vitellogenin
noun
vi·tel·lo·gen·in
vī-ˌte-lō-ˈje-nən
: a precursor protein of egg yolk normally in the blood or hemolymph only of females that is used as a biomarker in vertebrates of exposure to environmental estrogens which stimulate elevated levels in males as well as females
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Merriam-Webster unabridged
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