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On Mon, Apr 15, 2013 at 11:47 AM, James Holton <[log in to unmask]> wrote: > However, I'm sure the day is not far off when phenix.refine or the like > will check if the starting R factor is too high and just "automatically" > invoke a run of MR to see if something clicks. > I think the latest Phaser code actually does the reverse: if the R-factor is already relatively low, it just outputs the search model. The more problematic (and very common) situation is where the structures are slightly isomorphous and rigid-body plus restrained refinement alone could work, but MR might work better - I don't think anyone has comprehensively evaluated this. We usually just run Phaser because compared to rebuilding and refinement, it's simply not that much of a bottleneck. -Nat