Which of the following titles best summarizes the passage? A. Is Molecular Biology the Key to Understanding Intercellular Communication in the Brain? B. Molecular Biology: Can Researchers Exploit Its Techniques to Synthesize Peptide Hormones? C. The Advantages and Disadvantages of the Immunological Approach to Detecting Peptide Hormones D. Peptide Hormones: How Scientists Are Attempting to Solve Problems of Their Detection E. Peptide Hormones: The Role Played by Messenger RNA's in Their Detection