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]:  Mutation of the HNF3 element significantly reduced promoter activity in HepG2 cells , whereas this element in isolation conferred HNF3beta responsiveness to a heterologous promoter .
[A]: HNF3 element


[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


[Q]:  Purified phosphorylated PhoP ( PhoPP ) had a half - life of approximately 2 . 5 h , which was reduced to about 15 min by addition of the same molar amount of * PhoR ( the cytoplasmic region of PhoR ) .
[A]:
* PhoR