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.

 We have previously described the partial purification of Ap4A hydrolase from S . pombe [ Robinson , de la Pena and Barnes ( 1993 ) Biochim .
Ap4A hydrolase

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

 The Valpha and Vbeta domains have the canonical features of known teleost and mammalian TCR V domains , including conserved residues in the beginning of FR2 and at the end of FR3 .

Vbeta domains