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Virological synapse formed between HTLV-1 infected CD4+ T-cell (PBMC) and an autologous uninfected CD4+ T-cell as a target cell. These cells were stained against HTLV-1 Gag p19 matrix protein with a specific monoclonal antibody (GIN7). A large immunolabeled HTLV-1 particle is visible between the two cell membranes. See Figure 4D of Majorovits et al., 2008.