3.2.1.24 3 - 40% remaining activity 135970 3.2.1.24 3.3 5.5 50% activity at pH 3.3 and pH 5.5 135996 3.2.1.24 3.8 5.5 50% activity at pH 3.8 and pH 5.5 136007 3.2.1.24 4.5 - 45% remaining activity 135970 3.2.1.24 4.5 - instability below pH 4.5 729186 3.2.1.24 4.5 6 stable for 6 months at 4°C 136000 3.2.1.24 4.5 6.5 completely stable at 75°C for 24 h, slightly less stable in buffers at pH 4.5 135977 3.2.1.24 4.8 8 stable for 5 h at 20°C 135985 3.2.1.24 5 7 stable within 136020 3.2.1.24 5 8 stable within 136021