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Dear Crystallographers, While I acknowledge that assigning solvent/ions/waters to blobs of density is prone to subjectivity, does anyone here know of any attempts to rigorously assign solvent blobs based on their characteristics, e.g., nearby residue types, height of peak, etc? I wrote previously to the BB about distinguishing Na from water, and got the message that it is far from simple to distinguish the two, but what about others? I guess the question driving this email is to what degree can one trust solvent assignments in the pdb? Does it have to be a case-by-case evaluation? Does anyone know of a good publication addressing this dilemma? Jacob -- ******************************************* Jacob Pearson Keller Northwestern University Medical Scientist Training Program cel: 773.608.9185 email: [log in to unmask] *******************************************