Affiliation: | (1) Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3202, USA;(2) Present address: Centre for Molecular Medicine and Therapeutics, University of British Columbia, 950 West 28th avenue, Vancouver, V5Z 4H4, Canada;(3) Present address: Department of Biochemistry, Washington University School of Medicine, 251 McDonnell Science Building, Saint Louis, MO 63110, USA; |