Skin Deep (IMAGE) Rockefeller University Caption A sample from one psoriasis patient shows thickening of the outer layer of skin, known as the epidermis (top). Eight weeks after treatment, the epidermis has thinned to a normal level (bottom). Credit Laboratory of Investigative Dermatology at Rockefeller University/<I>Journal of Allergy and Clinical Immunology</I> Usage Restrictions Image may only be used to illustrate research described in accompanying story. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.