TASK DEFINITION: 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.
PROBLEM:  Pax5 thus functions both as a transcriptional repressor and activator , depending on its interactions with corepressors of the Groucho protein family or with positive regulators such as the TATA - binding protein .

SOLUTION: Groucho protein family

PROBLEM:  In the five - protein system , Hip prevents inhibition of assembly by the hsp70 co - chaperone BAG - 1 , and cotransfection of Hip with BAG - 1 opposes BAG - 1 reduction of steroid binding activity in COS cells .

SOLUTION: BAG - 1

PROBLEM:  However , in spleen cells in vitro costimulation via the TCR is necessary for optimal IL - 2 gene induction .

SOLUTION:
IL - 2