Positive Samples: A-431 Immunogen sequence: MEDPSEPDRL ASADGGSPEE EEDGEREPLL PRIAWAHPRR GAPGSAVRLL DAAGEEGEAG DEELPLPPGD VGVSRSSSAE LDRSRPAVSV TIGTSEMNAF LDDPEFADIM LRAEQAIEVG. PI4K2B lipid kinase is a member of the phosphatidylinositol 4-kinase family (