Notably, since CYP1B1 catalyzes the activation of 7,12‐Di‐Methyl‐Benz[a] Anthracene (DMBA), Cyp1b1‐null mice have a drastic decreased frequency to develop malignant lymphomas after administration with DMBA compared to wild‐type mice [25]. Here, CYP1B1 is linked to lymphoma.