Affiliation: | (1) Department of Biochemistry, University of Helsinki, Finland;(2) Wallenberg Laboratory, Department of Endocrinology, University of Lund, Malmö General Hospital, S-21 401 Malmö, Sweden;(3) Department of Medicine, The University of Chicago, Chicago, Illinois, USA;(4) Howard Hughes Medical Institute, and Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, Illinois, USA |