The mouse anti-HA monoclonal antibody (mAb) and the mouse anti-human IgG (29.5; Fc specific; anti-Fc) were generated in our lab and have been previously described (17 (link)). The anti-human IgG (Fc specific) labelled with peroxidase (POD) was from Sigma-Aldrich, the anti-human PD-1 (clone EH12.2H7) from BioLegend, and the anti-mouse IgG-PE and IgG-APC from Jackson ImmunoResearch. The rabbit anti-HA (clone C29F4) and the anti-β-actin (clone C4) mAbs, and the anti-rabbit IgG-POD, and the anti-mouse IgG-HRP, were from Cell Signaling, MP Biomedicals, Promega, and Sigma-Aldrich, respectively. The streptavidin-AF555 and the anti-rabbit IgG (H+L)-biotinylated were from Life Technologies and Jackson Immunoresearch, respectively. The anti-human CD14-APC (clone M5E2) mAb employed to stain surface expression of anti-CD3 single chain fragments, and the anti-mouse CD45-APC (clone 104) mAb used to exclude the TCS in the reporter assays, were obtained from BioLegend.
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