The blood-brain barrier.

  The hormone leptin regulates food intake and body weight. It can cross the blood-brain barrier. Search PubMed (www.pubmed.gov) for blood-brain barrier and leptin and select two original research articles about leptin. Summarize the results of these articles. Which proprieties of leptin allow it to cross the blood-brain barrier? How does leptin regulate energy balance? Be detailed in your explanation and support your answer with facts from your textbook, research, and articles from scholarly journals. In addition, remember to add references in APA format to your posts to avoid plagiarism.