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.

Indeed , in vivo primed T cells predominantly express p50 / p50 and p65 / p50 dimers , whereas these p50 - containing complexes are barely detectable in tolerant T cells that express p65 - and c - Rel - containing complexes .
c - Rel