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.

Ex Input:
This study was undertaken to evaluate the physical and biological characteristics of nebulized interleukin 2 liposomes .

Ex Output:
interleukin 2

Ex Input:
Both genes ARO3 and ARO4 are strongly regulated under the general control regulatory system .

Ex Output:
genes ARO3

Ex Input:
Two genes ( ptsI and ptsA ) that encode homologues of the energy coupling Enzyme I of the phosphoenolpyruvate - dependent sugar - transporting phosphotransferase system ( PTS ) have previously been identified on the Escherichia coli chromosome .

Ex Output:
Enzyme I