When I refine my seleno met residues in Phenix (1.8.4-1496) ALL my MSE are restrained to ONE conformer, in coot terms ptp #11 with a Chi 1 of 60 deg. This happens at the start of the second cycle when it does 'rsrl'. I can watch it happen in coot. POP! There is goes. Some of the MSE are in this conformation, but not all of them. This refinement is wrong, so how do I correct it? thanks kas -- Kenneth A. Satyshur, M.S.,Ph.D. Senior Scientist University of Wisconsin Madison, Wisconsin 53706 608-215-5207