Mouse hepatocyte AML-12 cell line, and human monocytic leukemia THP-1 cells were used in two studies, and human hepatocytes, rat hepatocytes, mouse peritoneal macrophages, isolated mouse hepatocytes, cyclooxygenase-2 knockdown cell line and human kidney HEK-293 T cells were used in one study. Here, PTGS2 is linked to monocytic leukemia.