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:  Although several other signal transduction molecules also contain tandemly occurring SH3 and SH2 domains , the function of these closely spaced domains is not well understood .
Example Output: SH2 domains

Example Input:  Unlike CSK , the SH3 domain of HYL was unique since the ALYDY motif was absent .
Example Output: SH3 domain

Example Input:  Effectively , the upstream , housekeeping - type promoter responds to FIXK and positively regulates the downstream , sigma 54 - type promoter .
Example Output:
sigma 54