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]: Plasma prolactin concentrations during incubation , 25 . 8 + / - 2 . 3 ng / ml , decreased to baseline levels , 10 . 8 + / - 1 . 9 ng / ml , within 24 hr after nestbox removal .
[A]: Plasma prolactin

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

[Q]: Administration of SnCl2 and ZnSO4 ( group V ) resulted in a decrease of ALA - D activity and in an increase in CP - U .
[A]:
ALA - D