Institution: | (1) Wellcome Research Laboratories, Langley Court, BR3 3BS Beckenham, Kent, U.K.;(2) School of Biological Sciences, Portsmouth Polytechnic, PO1 2DY Portsmouth, Hants, U.K.;(3) SmithKline Beecham Pharmaceuticals, The Frythe, AL6 9AR Welwyn, Herts, U.K. |