In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 It is a pterin 4alpha - carbinolamine dehydratase that is involved in the regeneration of the cofactor tetrahydrobiopterin during the phenylalanine hydroxylase - catalyzed hydroxylation of phenylalanine .
cofactor tetrahydrobiopterin

 Friend of GATA ( FOG ) proteins regulate GATA factor - activated gene transcription .
GATA factor

 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 .

HIV - 1