instruction:
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.
question:
This mutant also functions in vivo as a trans - acting dominant negative regulator : the transcriptional inducibility of the HIV long terminal repeat ( which contains two potential NF - kappa B binding sites ) by phorbol ester ( PMA ) is inhibited when it is co - transfected into CD4 + T cells with the delta SP mutant .
answer:
CD4 +

question:
A DNA fragment that complements the uvs - 2 mutation was subcloned by monitoring its ability to transform the uvs - 2 mutant to MMS resistance .
answer:
uvs - 2

question:
To determine the role of the transmembrane region of HN on fusion - promoting activity , mutant HN proteins were expressed and their biological activities examined .
answer:
mutant HN proteins