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:  Mammalian homologues of the Polycomb - group gene Enhancer of zeste mediate gene silencing in Drosophila heterochromatin and at S . cerevisiae telomeres .

Output: Enhancer of zeste


Input: Consider Input:  Ptx1 belongs to an expanding family of bicoid - related vertebrate homeobox genes .

Output: bicoid - related


Input: Consider Input:  Characterization of human activating transcription factor 4 , a transcriptional activator that interacts with multiple domains of cAMP - responsive element - binding protein ( CREB ) - binding protein .


Output: activating transcription factor