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:  A signaling complex of Ca2 + - calmodulin - dependent protein kinase IV and protein phosphatase 2A [ see comments ]
Example Output: protein phosphatase 2A

Example Input:  To study the presence of estrogen - binding sites ( EBS ) in the synovial tissues of male and female patients with rheumatoid arthritis ( RA ) and in age - and sex - matched healthy controls .
Example Output: binding sites

Example Input:  The study shows that PU . 1 is expressed in NK cells and that , on cell transfer into alymphoid Rag2 / gammac ( - / - ) mice , hematopoietic progenitors of PU . 1 ( - / - ) fetal liver cells could generate functional NK cells but not B or T cells .
Example Output:
PU . 1