Related to Fig. 2 . (A) Representative images of human synovial explants incubated with infected Jurkat cells during 24 h and processed for immunohistological analyses. Nuclei (DAPI, gray), HIV-p24 (green), CD3 (CD4⁺ T cell marker, yellow), and CD68 (macrophage marker, red). Scale bar, 20 µm. (B) Gallery of representative images of ex vivo infection of alveolar macrophages isolated from adult broncho-alveolar lavages co-cultured for 24 h with 2 d-infected Jurkat cells in presence (anti-CD4) or not (Control) of neutralizing anti-CD4 antibody. Nuclei (DAPI, blue), F-actin (phalloidin, green), and HIV-p24 (red). Scale bars, 20 µm.