In article <4t5c3p$a9o at saphir.jouy.inra.fr>, <email> (<sbouhal>) wrote: ->I would like to separate a protein (Mr = 20000) from its modified form (blocked ->lysine residue) by ion exchange chromatography. Anyone has a suggestion ->on chromatographic conditions ? You must provide much more background on the protein to have any useful replies. - Dima