The largest amounts are available in beef (and other red meats), chicken, fish and dairy
Use glass or high-grade polypropylene labware and avoid prolonged contact with stainless steel or other chelating surfaces that can strip Cu(II) from the tripeptide
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By 1993, Yoshiko Sonoda successfully purified the human CYP51A1 protein from liver microsomes and demonstrated its catalytic activity upon reconstitution with NADPH cytochrome P450 reductase (3.20 mmol per mg of protein /min), identifying its molecular weight as approximately 53 kDa [12]