Happy new year everybody, I had quite a bit of difficulty with a SAD dataset which also showed Sulphur. Previously I had tried SHELEX to find sites, MLPHARE to refine, AddSOLVE to find more , and both SOLVE and PHASER to solve but it did not get to a point where I could do manual building. Autosol worked beautifully, the input files were scalepack merged data, ha.pdb (from addsolve step), and the sequence. PHASER to solve and TEXTAL & RESOLVE with through build option. This actually leave me with some confusions / questions: 1. When I compare the other "solutions", they look like the right one, just not good enough. Where exactly is the autosol making a difference? Is it the ability of of TEXTAL to build something more meaningful when the solution is not good or number of iterations? 2. How does PHASER know the different anomalous atoms? Does is use a different scaling factor for SE and S? 3. I see that phenix.refine has been used in the internal runs, I have used phenix.refine earlier. But after playing with the side chains in Coot, when I tried to use the modified pdb file and resolve.mtz, it complained about the good old Free_R flag. However, it ran directly in Refmac. Is it a known problem or maybe I did something stupid? I could do a dry run and change the read mtz and not cns if that would solve the problem. 4. Lastly, is it possible to use multiple processors to run the job? Best regards, Partha -- MRC National Institute for Medical Research Division of Molecular Structure The Ridgeway, NW7 1AA, UK Email: [email protected] Phone: + 44 208 816 2515