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.

 The Tat protein coded by human immunodeficiency virus ( HIV ) is a strong activator of viral gene expression from the long terminal repeat ( LTR ) .
Tat protein

 Activation of the cytotactin promoter by the homeobox - containing gene Evx - 1 .
cytotactin promoter

 These three phases of cyclin E association with chromatin may facilitate the diverse activities of cyclin E - - Cdk2 in initiating replication , blocking rereplication , and allowing resetting of origins after mitosis .

cyclin E