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.

Q:  Like the DMA , but unlike all other mammalian class II A genes , the zebrafish gene codes for two cysteine residues which might potentially be involved in the formation of a disulfide bond in the alpha 1 domain .

A: alpha 1
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Q:  In contrast to the p16 - mediated G1 block , G1 arrest mediated by the cdk inhibitors p21Cip1 or p27Kip1 cannot be bypassed either by inactivation of pRb or overexpression of E2F family members .

A: E2F family members
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Q:  The WEB2 gene encodes a 1 , 522 - amino - acid protein with homology to nucleic acid - dependent ATPases .

A:
WEB2 gene
****