[1] Univ Ghent VIB, Dept Plant Syst Biol, B-9052 Ghent, Belgium
[2] Broad Inst MIT & Harvard, Cambridge, MA USA
[3] Delft Univ Technol, Delft Bioinformat Lab, Delft, Netherlands
[4] Netherlands Canc Inst, Dept Mol Biol, Amsterdam, Netherlands
[5] Univ Penn, Dept Biol, Philadelphia, PA 19104 USA
[6] Univ Penn, PENN Genome Frontiers Inst, Philadelphia, PA 19104 USA