This book stems from the 2nd Parkinson's Disease Symposium on Neurotoxic Factors in Parkinson's Disease and Related Disorders, held on Augus 6-7, 1999 at the University of Ulm Medical School in Ulm at the Danube in Germany. The specific topic, neurotoxic factors in Parkinson's Disease, involves neurobiological, epidemiological and environmental factors that bring to light this second most common neurodegenerative disorder. This work is compiled by leading researchers in neurodegeneration from around the world, making it a unique, comprehensive, and useful publication.