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:  These data suggest that these kappa B - specific proteins have a role in the coordinate regulation of this growth factor - growth factor receptor gene system that controls T cell proliferation .
Example Output: growth factor receptor

Example Input:  [ Tumor histology and steroid receptors in breast carcinoma ]
Example Output: steroid receptors

Example Input:  However , the molecular mechanisms regulating SDF1 alpha - driven cell migration are not well defined .
Example Output:
SDF1 alpha