The metallothioneins are involved in the cellular sequestration of toxic metal ions and regulation of essential trace elements. This isoform binds exclusively copper. MPCGCGTSCKCGSGKCCCGSTCNCTTCPSKQSCSCNDGACGSACQCKTSCCCGADCKCSPCPMK MTCU_CALSI Copper-specific metallothionein-2 64 CuMT-II