MA2.1 mAb (against HLA-A2 and HLA-B17) Journal of Immunology HCA2 human fibroblast Journal of General Virology HEK-293 human embryonic kidney human kidney (embryonic) epithelium ATCC HeLa Henrietta Lacks human Cervical cancer epithelium DSMZ ECACC Hepa1c1c7 clone 7 of clone 1 hepatoma line 1 mouse Hepatoma epithelial ECACC ATCC HL-60 human leukemia