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:  By sequencing of exonuclease III deletion clones an open reading frame of 405 nucleotides was found coding for a protein of 135 amino acids with a molecular mass of 15 kDa .

SOLUTION: exonuclease III

PROBLEM:  Glutathione reductase activities in liver , kidney , lung , and brain were not affected by diet .

SOLUTION: Glutathione reductase

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