could it be a PEG molecule?
Quoting "Read, Jon":
> Anyone see anything like this before? The data is 1.7Angstrom data with
> good statistics. The picture shows the solid FoFc density contoured at 3
> Sigma in light brown and -3 Sigma in purple. The density is odd as it
> appears to be bound to a peptide carbonyl with no other obvious
> interactions with the protein. There is a characteristic tail at one
> end.
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