Hello again! Perhaps I should add that I am interested in calculation of tertiary as well as (only) secondary structure. Any help appreciated Thanks Joerg Rodemann -- Joerg 'George' Rodemann Erhard-Groezinger-Strasse 82 Department of Physics D-89134 Blaustein University of Ulm Tel. (0731) 553319 e-mail: rodemann at mathematik.uni-ulm.de