[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[2] Princeton Univ, Lewis Sigler Inst Integrat Genom, Carl Icahn Lab, Princeton, NJ 08544 USA
[3] Princeton Univ, Dept Mol Biol, Lewis Thomas Lab, Princeton, NJ 08544 USA
[4] Univ Rochester, Dept Biochem & Biophys, Sch Med & Dent, Rochester, NY 14642 USA
[5] Princeton Univ, Dept Chem, Frick Lab, Princeton, NJ 08544 USA