1. Department
of Biochemistry, University of Cambridge, The Sanger Building, 80 Tennis Court
Road, Cambridge CB2 1GA, U.K.
2. Department
of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, U.K.
3. Medical
Research Council Human Nutrition Research, The Elsie Widdowson Laboratory, 120 Fulbourn Road, Cambridge CB1 9NL, U.K.