[1] Univ Manchester, Dermatol Ctr, Manchester, Lancs, England
[2] Imclone Syst Inc, New York, NY USA
[3] Harvard Univ, Sch Med, Dept Pathol, Boston, MA 02115 USA
[4] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Cutaneous Biol Res Ctr, Charlestown, MA USA