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

SOLUTION: Tat protein

PROBLEM:  We conclude from these observations that the cTnC 3 ' Ile element is a composite enhancer that functions through the combined interactions of at least five regulatory elements and their cognate binding factors : three or four E - boxes , a MEF - 2 site , and a MEF - 3 site .

SOLUTION: MEF - 2

PROBLEM:  A close homologue of the APK2a gene , named APK2b , was also isolated from the Arabidopsis cDNA library .

SOLUTION:
APK2a gene