Hi guys
 
Sorry for the non ccp4 based question but i was wondering if anyone has any tips on producing a suitable cryo buffer for crystals grown in peg8000. My crystals come out quite quickly in 15 to 10% peg and can be quite large. Ive tried to increase the peg concentration, replacing  the peg with glycerol or using a combination of peg8000 and glycerol but each time the crystals fail to diffract when flash frozen. Previous experience with these crystals have shown diffraction of up to 2A when dry mounted.
 
thanks,
 
 
vince

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