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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