The metallothionein Mt4 binds 10 atoms of copper(I) (Tio et al. 2004). Mt4 has greater affinity for copper than does Mt1 and Mt4 is therefore considered a "copper-thionein" as opposed to a zinc-thionein (Tio et al. 2004).
Atrian, S, Tío, L, Villarreal, L, Capdevila, M
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