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The complete amino acid sequence of thionein-II, one of the two major mouse liver thionein components, was determined. The main fragmentation of thionein-II, which consists of 61 amino acid residues, was accomplished by digesting the S-[14C]-carboxymethylated protein and the cyanogen bromide-treated oxidized protein with trypsin. The peptides obtained by papain digestion of S-[14C]carboxymethylated thionein-II were used to align the major tryptic peptides. The sequence was determined by a combination of automated and manual Edman degradation techniques. Remarkable structural homology is observed in mouse thionein-I, mouse thionein-II, and thioneins from man and horse.
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Huang et al. (1981) studied this question.
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