2.4.1.186 alkali-stable 637622 2.4.1.186 concentrated to 8 mg/ml, and 100 microl aliquots are flash frozen in liquid nitrogen and stored at -80°C. Glycogenin stored in this manner is stable for at least 2 years. 671775 2.4.1.186 loss of activity on Q-Sepharose during ion exchange chromatography 638246