Secreted T1-IFNbp bind back to the cell surface of infected and uninfected cells <i>in vitro</i>.

<p>L929 cells were left uninfected (top panels), infected with ECTV-GFP (middle panels) or ECTV Δ166-GFP (lower panels). 6 h after infection, the presence of T1-IFNbp at the cell surface was detected using anti-T1IFNbp (left panels) or naïve control sera (right panel). The data are representative of two similar experiments.