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

Answer: Tat protein


Question:  First , a GATA - 1 motif was found to bind nuclear factor ( s ) , presumably the GATA - 1 factor , present in K - 562 cell extracts and in living K - 562 cells .

Answer: GATA - 1


Question:  Effect of age on glucose , reducing sugars and plasma insulin in blood of milk - fed calves .

Answer:
plasma insulin