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[ccp4bb]: Modified Arg

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Not strictly CCP4 but...

I have a 1.7A map with an ARG that appers to have what
looks like two Methyl groups bonded to the NH1 and NH2
nitrogens. The protein was expressed in E. coli
and I have not seen this kind of post-translational modification
before. Any ideas what it might be?

I don't think it is mobility, as the rest of the ARG
has excellent density.