[1] Univ Liverpool, Diabet & Endocrinol Res Unit, Diabet & Endocrinol Res Grp, Liverpool L69 3GA, Merseyside, England
[2] SmithKline Beecham Pharmaceut, Div Neurosci, Harlow CM19 5AD, Essex, England
[3] SmithKline Beecham Pharmaceut, Div Vasc Biol, Harlow CM19 5AD, Essex, England