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RGE blocks the human PD-1/PD-L1 interaction activity in vitro. (A) RGE blocks the hPD-1/hPD-L1 interaction as determined by competitive ELISA. (B,C) Human PD-1 neutralizing antibody (B) and human PD-L1 neutralizing antibody (C) act as positive controls. The assays were performed in triplicate at each concentration.
