This volume represents an attempt by scientists in a variety of disciplines to uncover the etiology of psoriasis. These specialists are working together to achieve a common goal: the translation of basic and clinical research data into better patient care. Included in the book are major developments in analytical tools, medical technology, and the understanding of basic biological processes at the cellular and molecular levels. Also discussed are recent advances in tissue culture and genetic chemistry as well as the details revealed by electron microscopy. P soriasis: Proceedings of the Fourth International Symposium will interest researchers and clinicians in the fields of dermatology, genetics, cellular biology, biochemistry, epidemiology, and immunology.