[1] Wistar Inst Anat & Biol, Melanoma Res Ctr, Philadelphia, PA 19104 USA
[2] New Jersey Inst Technol, Dept Comp Sci, Newark, NJ 07102 USA
[3] Univ Munich, Dept Dermatol, D-80539 Munich, Germany
[4] Wistar Inst Anat & Biol, Gene Express & Regulat Program, Philadelphia, PA 19104 USA
[5] Massachusetts Gen Hosp, Cutaneous Biol Res Ctr, Boston, MA 02114 USA