Bioinformatics Group, Albert-Ludwigs-University Freiburg, Georges-Koehler-Allee 106, Freiburg D-79110, Germany. IntaRNA@informatik.uni-freiburg.de|Bioinformatics Group, Albert-Ludwigs-University Freiburg, Georges-Koehler-Allee 106, Freiburg D-79110, Germany. IntaRNA@informatik.uni-freiburg.de|Bioinformatics Group, Albert-Ludwigs-University Freiburg, Georges-Koehler-Allee 106, Freiburg D-79110, Germany. IntaRNA@informatik.uni-freiburg.de