The cytP450 was selected as the CYP1B1, due to its eukaryotic origin and its importance as a tumour suppressor, although both 1B1 and 1A2 isoenzymes produce a second tetrahydroxystilbene product, not structurally well characterized, named M1 (Piver et al., 2004). The gene discussed is CYP1B1; the disease is neoplasm.