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: Increased TRE DNA binding failed to lead to increased transactivation correlating with the inability of SB 203580 to increase phosphorylation of these AP - 1 proteins .

Output: AP - 1

Input: Consider Input: Although polyubiquitin chains linked through Lys ( 29 ) of ubiquitin have been implicated in the targeting of certain substrates to proteasomes , the signaling properties of these chains are poorly understood .

Output: polyubiquitin chains

Input: Consider Input: Evidence that the AT1A receptor activates transcription factor - Stat91 and / or a related protein .
Output: AT1A receptor