Dear all,
I have been working on the refinement of a crystal structure using phenix.refine from the 1.12-2828-Intel-Linux-2.6 version of Phenix. I have recently replaced my computer by a MacBook and I have upgraded Phenix to the 1.18.2-3874-MacOs version. However, I found that the refinement introduced an amazing huge amount of outliers, specially C-beta and ramachandran.

The structure is at 2.5A resolution and I used the following refinement strategy: XYZ coordinates, Real-space, Individual B-factors, occupancies, X-ray/stereochemistry weight optimization, no experimental phase restrain, automatic metal and ligand linking and automatic correct N/H/Q errors. I also tried using TLS instead of Indivudal B-factors, but the problems persist.

Does anybody know why this could be happening? Thanks a lot for your help!

Best,

Juan

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