Protein that forms part of the yolk of egg-laying vertebrates.
Note: Its expression in male fish is used in ecotoxicology as an indicator of exposure to environmental estrogenicendocrine disruptors.
Source: PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 820 (https://doi.org/10.1515/pac-2015-1202)