It could be your crystals are actually stacks of plates, each slightly
twisted from the last. Happened to me once - in that case microseeding,
adding ~5% PEG 400 to the recipe, and screening lots of crystals did the
trick.
Phoebe Rice
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Phoebe Rice
University of Chicago
Dept of Biochem & Molec Biol
price at midway.uchicago.eduhttp://molbio.uchicago.edu/Faculty/Phoebe_Rice.html