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]:  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 .
[EX A]: Plasma prolactin

[EX Q]:  Using unidirectional PCR we isolated a 361 - bp 5 ' promoter region and delineated the intronic / exonic boundaries which include a non - coding exon 1 , a single intron , and a coding exon 2 , a structure that is typical of genes of the RNase A superfamily .
[EX A]: RNase A superfamily

[EX Q]:  The encoded 260 - amino - acid ( aa ) ( H1 - I ) and 240 - aa ( H1 - II ) polypeptides possess the typical tripartite organization of animal H1 histones , with variable N - and C - terminal domains flanking a conserved ' globular ' DNA - binding domain .
[EX A]:
animal H1 histones