In case you are using a "standard" purification protocol (with, say, two
purification steps and a polishing gel filtration) you might also try adding yet
another purification step, no matter how pure your sample looks on SDS-PAGE.
Tim
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Tim Gruene
Institut fuer anorganische Chemie
Tammannstr. 4
D-37077 Goettingen
GPG Key ID = A46BEE1A
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