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.

[Q]:  To investigate the role of costimulation of OX40 in human immunodeficiency virus type 1 ( HIV - 1 ) infection by its natural ligand , gp34 , the OX40 - transfected ACH - 2 cell line , ACH - 2 / OX40 , chronically infected with HIV - 1 , was cocultured with paraformaldehyde ( PFA ) - fixed gp34 - transfected mouse cell line , SV - T2 / gp34 .
[A]: HIV - 1


[Q]:  We show that dispersion of PML bodies by Z requires a portion of the transcriptional activation domain of Z but not the DNA - binding function .
[A]: transcriptional activation domain


[Q]:  A significantly positive correlation was found between ST1 expression , and p53 tumour suppressor gene product ( p = 0 . 004 ) , and a relationship with c - erbB - 2 protein and progesterone receptor status was also indicated .
[A]:
progesterone receptor