Division of Genetics;
Department of Medicine;
Brigham and Women's Hospital;
Department of Biological Chemistry and Molecular Pharmacology;
Harvard Medical School;
Boston 02115;
USA;
Department of Chemistry;
Texas A&M University;
College Station 77B40;
USA;
清华大学化学系;
北京100084;
清华大学生命学院;
北京100084;
Department of Plant and Pathology and Microbiology;
Texas A&M University;
College Station 77840;
USA;
Department of Biology;
Texas A&M University;
College Station 77840;
USA;