1.14.99.4 1 mg/ml albumin stabilizes crude enzyme extract for 1 month when kept frozen 438216 1.14.99.4 10 h dialysis of purified enzyme against 0.01 M Tris buffer, pH 7.5, 0.005 M EDTA, leads to 50% loss of activity 438216 1.14.99.4 EDTA affords some protection, especially for crude extracts 438216 1.14.99.4 preparation is highly unstable 438216