Dear Crystallographers,

I am looking at a 1.0 Angstrom structure which contains many waters, but I am wondering whether some of them might really be sodium ions. Is there any straightforward way to distinguish between these two, and if so, what is the software which implements this? Although the electron density difference between sodium and water should be very small, perhaps the binding geometry would provide a clearer distinction? Has anybody encountered this question before?

Regards,

Jacob Keller

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Jacob Pearson Keller
Northwestern University
Medical Scientist Training Program
Dallos Laboratory
F. Searle 1-240
2240 Campus Drive
Evanston IL 60208
lab: 847.491.2438
cel: 773.608.9185
email: j-kell...@northwestern.edu
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