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The effect of a cryoprotectant (glycerol) upon the mosaicity of flash-frozen T-state glycogen phosphorylase b crystals has been investigated. Glycerol concentration in a buffered solution was varied between 0 and 70% v/v. The results show that there is a well defined optimum in glycerol concentration giving lowest mosaicity, maximum resolution and no ice formation. The results also demonstrate how flash-freezing conditions can be systematically determined in-house using a minimum number of crystals and before using synchrotron time.
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