Sure - crystallization selects what packs, which may constitute a very minor 
fraction of what you set up drops with. 1DUH is an example...
-Luca

> On Apr 8, 2015, at 15:08, Sebastiaan Werten 
> <sebastiaan.wer...@uni-greifswald.de> wrote:
> 
> Dear all,
> 
> we are currently working on a protein that is known to exist in a 
> monomer-dimer equilibrium. At the high concentrations used for 
> crystallisation assays, the dimer is predominant and the monomer practically 
> undetectable.
> 
> Nevertheless, one of the crystal forms that we have obtained contains the 
> monomeric species, not the dimer.
> 
> I was wondering if anyone is aware of similar (published) cases, and if the 
> phenomenon as such has been discussed in detail anywhere?
> 
> I did literature searches but so far couldn't find anything.
> 
> Any pointers would be much appreciated!
> 
> Best wishes,
> 
> Sebastiaan Werten.
> 

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