chapter 1 Tryptophan: A Unique Entity -- chapter 2 Findings in Deficiency States -- chapter 3 Genetics -- chapter 4 Chemical Pathways, Protein Metabolism, and Interrelationships -- chapter 5 Blood and Hormonal Responses to Tryptophan (Deficiency or Excess) -- chapter 6 Tryptophan Effects or Influences on Biological Processes -- chapter 7 Effects or Influences on Organ Systems -- chapter 8 Pharmacology and Selected Therapeutic Uses -- chapter 9 Toxicity -- chapter 10 Serotonin and Melatonin -- chapter 11 The Eosinophilia Myalgia Syndrome: A Tryptophan Tragedy -- chapter 12 Tryptophan: Past and Future Directions.