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.

[EX Q]: Matrix metalloproteinase s ( MMPs ) are a group of enzymes thought to be responsible for both normal connective tissue matrix remodelling and accelerated breakdown associated with tumour development .
[EX A]: Matrix metalloproteinase

[EX Q]: The present study first shows that OX40 - gp34 interaction stimulates HIV - 1 expression and suggests that OX40 triggering by gp34 may play an important role in enhancing HIV - 1 production in both acutely and latently infected CD4 ( + ) T cells in vivo .
[EX A]: HIV - 1

[EX Q]: Through primer extension analysis , we found that the transcription of the h2B4 gene initiates at multiple start sites .
[EX A]:
h2B4 gene