GRE Reading Comprehension: ETS-GRE阅读ETS - 83RQTPGKZRLJ54W57

The passage suggests that a substance detected in the brain by use of antiserums to peptide hormones may A. have been stored in the brain for a long period of time B. play no role in the functioning of the brain C. have been produced in some part of the body other than the brain D. have escaped detection by molecular methods E. play an important role in the functioning of the hypothalamus