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


question:
 T cell stage - specific PcG expression profiles suggest that PcG genes contribute to regulation of T cell differentiation .
answer:
PcG genes


question:
 Human T cell leukemia virus type 1 ( HTLV - 1 ) Tax protein transforms primary human T cells in vitro .
answer:

Tax protein