[1] Australian Natl Univ, John Curtin Sch Med Res, Med Genome Ctr, Australian Canc Res Fdn,Genet Lab, Canberra, ACT 2601, Australia
[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[3] Washington Univ, Sch Med, Dept Pathol, St Louis, MO 63110 USA
[4] Washington Univ, Sch Med, Howard Hughes Med Inst, St Louis, MO 63110 USA