From Departments of Dermatology, Fundación Jiménez Díaz, Universidad Autónoma (L.R.) and Hospital Universitario San Carlos (E.S.Y. and E.R.); and Department of Cell Biology (P.S.), Universidad Complutense, Madrid, Spain.
This paper was presented in part at the 14th Colloquium of the International Society of Dermatopathology, Siena, Italy, June 29, 1993.
Address correspondence and reprint requests to Dr. L. Requena, C/Leopoldo Alas Clarin 4-3°D, 28035-Madrid, Spain.