In addition, Boswellia serrata extracts, as well as KBA and AKBA, are not P-glycoprotein (Pgp) substrates and are identified as potent inhibitors of Pgp in porcine brain capillary endothelial cells and human lymphocytic leukemia parenteral cell lines [58, 59]. The gene discussed is ABCB1; the disease is lymphoid leukemia.