Hi all, Right now, if you do the "chain trace" action (or type "chain @ca") Chimera shows carbon alphas and any inter-residue connectivity of those residues, including disulfide linkages. I'd like to know if users generally like this behavior or would instead prefer a "strict" backbone-only trace, so I can determine whether to change the behavior, offer both alternatives, or leave things alone. This is only really relevant to the "trace" depiction since although the "full" and "minimal" backbone depictions also show disulfides, that can be turned off by turning off auto-chaining via the Model Panel, Selection Inspector, or "setattr" command*. So what do people think? --Eric Eric Pettersen UCSF Computer Graphics Lab pett@cgl.ucsf.edu http://www.cgl.ucsf.edu * in the setattr command you would be setting "autochain" to false.