Binding of human anti-HIV-1 Env and control monoclonal IgG antibodies (mGO53 [Wardemann et al., 2003 (link)] and ED38 [Meffre et al., 2004 (link)]) to HEp-2 cell–expressing autoantigens was analyzed at 100 µg/ml by indirect IFA (ANA HEp-2 AeskuSlides; Aesku.Diagnostics) following the manufacturer’s instructions in two independent experiments. IFA sections were examined using the fluorescence microscope Axio Imager 2 (Zeiss), and pictures were taken at magnification 40× with 5,000 ms–acquisition using ZEN imaging software (Zen 2.0 blue version; Zeiss) at the Photonic BioImaging platform (Institut Pasteur).