1. L. Stephens, K. Anderson, J. Coadwell, P. T. Hawkins, Inositide Laboratory, The Babraham Institute, Babraham, Cambridge CB2 4AT, UK.
2. D. Stokoe and F. McCormick, University of California, San Francisco, Cancer Research Institute, 2340 Sutter Street, San Francisco CA, 94115, USA.
3. H. Erdjument-Bromage and P. Tempst, Molecular Biology Program, Memorial Sloan-Kettering, Cancer Center, 1275 York Avenue, New York NY 10021, USA.
4. G. F. Painter and A. B. Holmes, Department of Chemistry, Cambridge University, Cambridge, UK.
5. P. R. J. Gaffney and C. B. Reese, Department of Chemistry, Kings College, London, UK.