Learning and Memory -- Animal Models of Anxiety -- Genetic Alterations of the Murine Serotonergic Gene Pathway: The Neurodevelopmental Basis of Anxiety -- Mutagenesis and Knockout Models: Hypothalamic-Pituitary-Adrenocortical System -- Mutagenesis and Knockout Models: NK1 and Substance P -- Genetic Epidemiology of Anxiety Disorders -- Interactions Between Corticotropin-Releasing Hormone and Ser…