Redox Reduction
Ion exchange
Enzymes

https://en.m.wikipedia.org/wiki/Oxidoreductase

Nucleophile
Cysteine Enzyme
Sulfur Sulfhydryl Thiol
Metallothionein

Metallothionein production is dependent on availability of the dietary minerals such as zinc, copper, and selenium, as well as the amino acids histidine and cysteine.

https://en.m.wikipedia.org/wiki/Metallothionein

https://en.m.wikipedia.org/wiki/Cysteine

https://en.m.wikipedia.org/wiki/Inorganic_ions

https://en.m.wikipedia.org/wiki/Nucleophile