http://cancer.med.upenn.edu/resources/
This page provides links to many other places where you get information about the p53 tumor-suppressor factor. It provides additional links related to cancer as well.

http://www.medic.mie-u.ac.jp/derma/anatomy.html
This site has a very clear color micrograph of a skin section with clickable areas for more details. The site includes links to other dermatology pages.

http://www-sci.lib.uci.edu/~martindale/Medical.html#Derm
Links to many good dermatology sites.