tokens: When primary activated CD4 ( + ) T cells acutely infected with HIV-1 ( NL4-3 ) ( CXCR4-using T-cell-line-tropic ) were cocultured with PFA-fixed gp34 ( + ) human T-cell leukemia virus type 1-bearing MT-2 cells or SV-T2/gp34 cells , HIV-1 production was also markedly enhanced .