Variable Baseline Papio cynocephalus Endogenous Retrovirus (PcEV) expression is upregulated in acutely SIV-infected macaques and correlated with expression of the interferon-stimulated gene STAT1 Expression in the Spleen, Maze, E.A., Ham, C., Kelly, J., Ussher, L., Almond, N., Towers, G., Berry, N. and Belshaw, R., Front. Immunol., 2019, 10.3389/fimmu.2019.00901