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 clones contain most of the exon of cyclin D2 except exon 5 .
Example Output: cyclin D2

Example Input:  By computed homology search , we noticed significant similarities between US3 PK and p21 - activated kinase ( PAK ) , which is activated by the Cdc42 or Rac .
Example Output: US3 PK

Example Input:  GH signals by interacting with GH receptor ( GHR ) .
Example Output:
GH receptor