You will be given a definition of a task first, then some input of the task.
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.

 Whether these translocations relate to a role for endogenous RARalpha in normal granulopoiesis remains uncertain because most studies addressing this question have used non - physiological overexpression systems .
Output:
endogenous RARalpha