Task: Named Entity Recognition
Input (English):  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 .
Output (English): HIV - 1