In the case of CYP3A4, CYP3A7, and CYP2E1 among Cytochrome P450 genes related to detoxicification of drug, HC iPSC and RA iPSC, which are undifferentiated cells, did not express well, but the markers were significantly increased in hepatocyte-like cells (Fig. 2k). The gene discussed is CYP3A7; the disease is rheumatoid arthritis.