have escaped detection by molecular methods
play an important role in the functioning of the hypothalamus
23. According to the passage, confirmation of the belief that peptide hormones are made in the brain in areas other than the hypothalamus would force scientists to
reject the theory that peptide hormones are made by endocrine glands
revise their beliefs about the ability of antiserums to detect peptide hormones
invent techniques that would allow them to locate accurately brain cells that produce peptide hormones
search for techniques that would enable them to distinguish peptide hormones from their close relatives
develop a theory that explains the role played by peptide hormones in the brain
24. Which of the following is mentioned in the passage as a drawback of the immunological method of detecting peptide hormones?
It cannot be used to detect the presence of growth regulators in the brain.
It cannot distinguish between the peptide hormones and substances that are very similar to them.
It uses antiserums that are unable to cross the blood-brain barrier.
It involves a purification process that requires extensive training in endocrinology.
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