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:  Keywords included reperfusion injury , transplantation , liver resection , nitric oxide , endothelin , cytokines , Kupffer cells , ischemic / ischaemic preconditioning , and nuclear factor - kappa B .
Example Output: nuclear factor

Example Input:  Rel family proteins regulate the expression of genes linked to kappa B - binding motifs .
Example Output: Rel family proteins

Example Input:  Suppression of HIV type 1 replication by a dominant - negative Ets - 1 mutant .
Example Output:
Ets - 1