Sausage: protein threading with flexible force fields

Sausage is a protein sequence threading program, but with remarkable run-ti me flexibility. Using different scripts, it can calculate protein sequence- structure alignments, search structure libraries, swap force fields, create models form alignments, convert file formats and analyse results. There ar e several different force fields which might be classed as knowledge-based, although they do not rely on Boltzmann statistics. Different force fields are used for alignment calculations and subsequent ranking of calculated mo dels.