EC 3.2.1.91 From Trichoderma longibrachiatum. Electrophoretically homogeneous (MW 65,000). In 3.2M ammonium sulphate. Specific activity: ~ 0.1 U/mg (40°C, pH 4.5, CM-cellulose 4M as substrate). Active on p-nitrophenyl-?-lactoside. Contaminants: endo-glucanase (cellulase) < 0.003U/mg. Stable at 4°C for > 4 years.