Affiliation: | 1. Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance and Cluster of Excellence Frankfurt Macromolecular Complexes (CEF), University of Frankfurt, 60438 Frankfurt (Germany);2. Research Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, P.O. Box 65, Helsinki 00014 (Finland), Fax: (+358)?9‐1915‐9541 http://www.biocenter.helsinki.fi/bi/iwai/ |