Dear Chimera developer, I've been working recently on a database on non-natural sidechains ( http://www.swisssidechain.ch). Among else, we've developed a novel approach to accurately predict rotamers and our paper will be submitted within a few days. I'd be very interested to develop a Chimera extension to visualize them (so far, we only have a PyMOL plug-in). I have rotamer library files in the same format as the Dunbrack 2002 rotamer library for each of the >200 sidechains included in my database. However, it appears that rotamer files (dependentRotamerData.zip) are encrypted in Chimera and I could not figure out how this encryption is done. I was wondering if you could advise me something to help me (especially whether there are some hard-coded part that would need to be modified to include new sidechains in Chimera) and if you'd be interested in such an extension. best David -- David Gfeller, PhD Molecular Modeling Swiss Institute of Bioinformatics http://ludwig-sun1.unil.ch/~dgfeller/homepage/