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]:  It is an untested argument that conventional beta - adrenoceptor antagonists possess unwanted metabolic effects that may counter some of their potential cardiac benefits .
[A]: beta - adrenoceptor


[Q]:  The two complexes were detected with a similar activation kinetics upon IL - 4 stimulation .
[A]: IL - 4


[Q]:  In contrast , no change in the level of either p53 or activation of mdm2 protein by p53 was observed in hamster UV61 cells after UV exposure .
[A]:
mdm2 protein