On Thu, Jul 12, 2007 at 11:10:54AM -0400, Jianghai Zhu wrote: > > How do I select a fragment of my molecule when there sequence numbers > are not consecutive? For example, I want to select residue 1-50, > 75-100, and 150-200 together. Thanks. Depends what you want to do with your fragment. You can't refine or regularize such a multi-range fragment (yet). Before trying it, I thought that if you wanted to create a molecule by atom selection (aka Copy Fragment), you could use: (1-50,75-100,150-200) But now I tried it, that doesn't seem to work. Baah. I don't know if that is a feature or a bug. The (mmdb) atom selection (as used in Coot) is described here; http://www.ebi.ac.uk/~keb/cldoc/object/cl_obj_selfnc.html#CMMDBManager::Select_CID