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Cytochrome P450 CYP1B1 is a recently cloned dioxin-inducible form of the cytochrome P450 family of xenobiotic metabolizing enzymes. CYP1B1 was found to be expressed at a high frequency in a wide range of human cancers of different histogenetic types, including cancers of the breast, colon, lung, esophagus, skin, lymph node, brain, and testis. There was no detectable immunostaining for CYP1B1 in normal tissues.(PMID:9230218). CYP1B1 is a 60 kDa protein that it also can be detected a band of 51 kDa or 57 kDa through the western blot(PMID:9525272; PMID: 9525272).