Book excerpt: The first and largest section of this encyclopedia offers entries on such topics as disease pathology (genetic influences, disease stages and diagnosis), brain anatomy and physiology (cellular and biochemical cholinergic changes, the nervous system and plaque formation), disease process (stages and subtypes of Alzheimer's, coexisting illnesses and associated disorders), research and treatment (therapeutic options, drug efficacy and clinical trials), care and caregivers (memory aids, caregiver burdens and respite care) and government programs (laws, research centers, and federal insurance programs). Section two is a representative list, by state and city, of home care providers and assisted living, adult day care and long-term residential treatment facilities, noting location, special accommodations, certifications, number of beds, accreditations, insurance information, and URL if available. Section three is a state-by-state list of the National Institute of Aging's Alzheimer's Disease Centers along with numerous other government, clinical and university affiliated treatment and research centers. Section four is a guide to a wide selection of resources including books, journals, support groups, organizations, and Internet sites.