metallothionein

https://doi.org/10.1351/goldbook.10950
One of a family of low-molecular mass proteins that binds metals such as zinc, copper, cadmium and mercury.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 778 [Terms] [Paper]