Affiliation: | 1. Marine Biological Laboratory, Woods Hole, MA 02543 (USA);2. Department of Biological Sciences, 1012 Fairchild, Columbia University, 1212 Amsterdam Avenue, New York, NY 10027 (USA), Fax: (+1)?212‐865‐8246;3. Howard Hughes Medical Institute and Departments of Pharmacology and Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093‐0647 (USA) |