Affiliation: | (1) Department of Biochemistry and Molecular Biology and Center for Biomolecular Structure and Function, The Pennsylvania State University , S-235 Frear Building, University Park, PA 16802, USA;(2) Department of Biology, University of Copenhagen, 2200 Copenhagen N, Denmark;(3) Present address: Department of Laboratory Medicine, University of Washington, Box 359690, Seattle, WA 98105, USA; |