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Flow-cytometry analysis of U-87, A-549, A-498, HeLa, and CaSki cell lines immunostained with the MAbs: (a) 15A4 (IgG2a subtype) (black line); (b) 1D5 (IgG2a subtype) (black line); irrelevant MAbs of IgG1 or IgG2a subtypes were used as negative control (gray line).
