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.

Input: Consider Input: The trans - activator protein Tax of human T - cell leukemia virus type I ( HTLV - I ) plays an important role in the development of adult T - cell leukemia through , at least in part , its ability to stimulate cell growth .

Output: trans - activator

Input: Consider Input: DNA - binding activity of nuclear factor - kappaB was determined by electrophoretic mobility shift assay .

Output: nuclear factor

Input: Consider Input: Within this fragment , three nucleic acid sequences are completely conserved in the murine CD4 gene .
Output: murine CD4 gene