metallothioneins that bind copper and zinc have an mr of 6500 daltons , consist of a single polypeptide chain of 61 amino acids , 25-30 percent of whose residues are cysteine , have a metal-binding capacity of between 5 and 7 g atoms/mol , and contain no disulfide bonds or aromatic amino acids .
C0025545
metallothioneins
C1323274
metal-binding