Purity ~90% (SDS-PAGE). Metallothioneins have a high content of cysteine residues that bind various heavy metals; these proteins are transcriptionally regulated by both heavy metals and glucocorticoids. Source: Recombinant protein corresponding to aa1-59 from human Metallothionein-2, fused to GST-Tag at N-terminal, expressed in E. coli. Molecular Weight: ~33.3kD AA