If, as the initial tests with cDNA probes suggest, peptide hormones really are made in the brain in areas other than the hypothalamus, a theory must be developed that explains their function in the brain. Some have suggested that the hormones are all growth regulators, but Rosens work on rat brains indicates that this cannot be true. A number of other researchers propose that they might be used for intercellular communication in the brain.
21. Which of the following titles best summarizes the passage?
Is Molecular Biology the Key to Understanding Intercellular Communication in the Brain?
Molecular Biology: Can Researchers Exploit Its Techniques to Synthesize Peptide Hormones?
The Advantages and Disadvantages of the Immunological Approach to Detecting Peptide Hormones
Peptide Hormones: How Scientists Are Attempting to Solve Problems of Their Detection and to Understand Their Function
Peptide Hormones: The Role Played by Messenger RNAs in Their Detection
22. The passage suggests that a substance detected in the brain by use of antiserums to peptide hormones may
have been stored in the brain for a long period of time
play no role in the functioning of the brain
have been produced in some part of the body other than the brain
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