an improved purification method of the sheep kidney nuclease ( nuclease sk ) specific for single-strans nucleic acid , which includes extraction with 0.85 % nacl , treatment with deae-cellulose , fractionation with polyethylene glycol , phospho-cellulose chromatography , cm-sephadex chromatography and phospho-cellulose rechromatography is described .
C0011050
deae-cellulose
C0007648
cellulose