1. From the Department of Pathological Sciences, University of Manchester (S.Q., J.A.M., S.K.); Christie Hospital, (S.Q., J.A.M., R.D.H., S.K.); Metropolitan University of Manchester (P.K.), Manchester, UK; Pharmingen, San Diego, Calif (J.M.W.); and Convatec, North Wales, UK (J.J.H.).