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:  Interestingly , unlike PAK65 , HPK1 does not contain the small GTPase Rac1 / Cdc42 - binding domain and does not bind to either Rac1 or Cdc42 , suggesting that HPK1 . activation is Rac1 / Cdc42 - independent .
Example Output: small GTPase

Example Input:  The present study also emphasizes the need of establishing dose - response curves to correctly assess the relative contribution of the different regions of steroid hormone receptors in activation of transcription .
Example Output: steroid hormone receptors

Example Input:  Therefore , a structural interaction between PsaL and PsaI may stabilize the association of PsaL with the photosystem I core .
Example Output:
photosystem I core