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]:  These results provide strong evidence that conserved interhelical packing interactions in the gp41 core are important determinants of HIV - 1 entry and its inhibition .
[EX A]: gp41 core

[EX Q]:  Serum IgM levels showed a highly significant increase in all types of brain tumour when compared to controls .
[EX A]: Serum IgM

[EX Q]:  The Fugu rubripes ( Fugu ) gene fragment was used to isolate the GH gene from a Fugu genomic library .
[EX A]:
GH gene