Both aAPC/mOKT3 and aAPC/A2 were derived from the human erythroleukemia cell line K562. The aAPC/mOKT3 expresses a membranous form of the anti-CD3 mAb (clone OKT3), as well as the costimulatory molecules CD80 and CD8325 (link). The aAPC/A2 expresses HLA-A2, CD80, and CD8327 (link). The human acute lymphoblastic leukemia cell line NALM6 was obtained from DSMZ (Braunschweig, Germany). The murine B-cell lymphoma cell line A20 and BALB/3T3 clone A31 were obtained from the American Type Culture Collection (ATCC) (Manassas, VA). All cells were routinely checked for the presence of mycoplasma contamination using PCR-based technology.
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