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.

Example Input:  Kappa B - specific DNA binding proteins : role in the regulation of human interleukin - 2 gene expression .
Example Output: interleukin - 2

Example Input:  GR complex activation , analyzed by DEAE - cellulose chromatography , was decreased in the patient .
Example Output: GR complex

Example Input:  Since the rise in E2 - receptor display paralleled a large increase in the proliferative activity of the cells as well as a change in their maturation status the question was raised as to whether the E2 - receptor should be considered as a physiological marker of growth rate or of cellular differentiation .
Example Output:
E2 - receptor