*** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.ccp4.ac.uk *** Just a short practical question, not directly related to crystallographic computing (sorry): Has someone used PEG 550 MME successfully as cryo-protectant? If so, at what concentrations? -- Mark van Raaij, m.vanraaij@chem.leidenuniv.nl