CD4 and infection: For example, PP-SLIDE predictions that CD127-expressing memory CD4+ T cells from tonsils were preferentially spared from productive infection was validated by infecting pre-purified CD127− versus CD127+ memory CD4+ T cells from the tonsils and demonstrating that CD127+ cells preferentially underwent latent infection by HIV (Cavrois et al., 2017; Hsiao et al., 2020).