Affiliation: | a Department of Biology, Scriptgen Pharmaceuticals, Inc., 200 Boston Avenue, Suite 3000, Medford, MA 02155, U.S.A. b Department of Biochemistry, Brandeis University, 415 South Street, Waltham, MA 02254, U.S.A. c Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, U.S.A. |