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: The selectivity of beta-adrenoceptor agonists at human beta1-, beta2- and beta3-adrenoceptors.
Example Output: beta-adrenoceptor

Example Input: Molecular recognition of histidine tRNA by histidyl-tRNA synthetase from hyperthermophilic archaeon, Aeropyrum pernix K1.
Example Output: histidyl-tRNA synthetase

Example Input: The effect of a novel transition state inhibitor of methylthioadenosine phosphorylase on pemetrexed activity.
Example Output:
methylthioadenosine phosphorylase