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:  Taken together , the data indicate that 2 , 2 ' , 4 , 6 , 6 ' - PeCB induces apoptosis in human monocytic cells through a mechanism that is independent of the arylhydrocarbon receptor .
Example Output: arylhydrocarbon receptor

Example Input:  Electrophoretic - mobility - shift assays showed that the core promoter ETS motif binds an Ets - related protein specifically expressed at high levels in CD4 + cells .
Example Output: core promoter

Example Input:  BMS - 189453 is a synthetic retinoid that acts as an antagonist at retinoic acid receptors alpha , beta , and gamma .
Example Output:
retinoic acid receptors