[1] Columbia Univ, Dept Biochem & Mol Biophys, CUBIC, New York, NY 10032 USA
[2] Columbia Univ, Ctr Computat Biol & Bioinformat, New York, NY 10032 USA
[3] Columbia Univ, Dept Biochem & Mol Biophys, NE Struct Genom Consortium, New York, NY 10032 USA
[4] Columbia Univ, Dept Pharmacol, New York, NY 10032 USA