[1] John Innes Inst, Dept Computat & Syst Biol, Norwich NR4 7UH, Norfolk, England
[2] John Innes Inst, Dept Metab Biol, Norwich NR4 7UH, Norfolk, England
[3] John Innes Inst, Dept Cell & Dev Biol, Norwich NR4 7UH, Norfolk, England
[4] European Bioinformat Inst, Cambridge CB10 1SD, England
[5] Cold Spring Harbor Lab, Cold Spring Harbor, NY 11724 USA
[6] NYU, Sch Med, New York, NY 10016 USA