Hi, I used fixbb in Rosetta 3.4 to thread a sequence on a template structure. There is a disulfide bond in the template structure, say, between two residues Nr. 20 and 50. My resfile looks like this: NATAA # keep native aa but packable! ... 20 A PIKAA G ... 50 A PIKAA G ... However, in the threaded model, all mutations specified in the resfile were realized except the two cystine residues. How can I force fixbb to mutate the two cystine residues?