Given the task definition and input, reply with output. 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.

As with the prototypical NF - kappa B p50 - p65 heterodimer , this novel p65 homodimeric form of NF - kappa B is functionally sequestered in the cytoplasm but rapidly appears in the nuclear compartment following cellular stimulation .
p65 homodimeric form