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]:  Intrathecal injections of small volumes of the alpha 2 - adrenoceptor agonists , xylazine and clonidine , into the cervical region of the spinal cord of conscious unrestrained sheep produced a dose - dependent analgesia of the forelimbs as measured using a mechanical pressure device .
[A]: alpha 2


[Q]:  Despite their high degree of sequence similarity , all five RFC genes are essential for cell proliferation in S . cerevisiae .
[A]: RFC genes


[Q]:  Searching the human DNA data base of expressed sequence tags ( EST ) revealed novel partial sequences similar to , but distinct from , the sequences of the previously known PEF proteins .
[A]:
PEF proteins