7. A substantially purified and isolated protein fraction, obtained from a composition according to claim 2 , and having at least 50% of its maximal cellulase activity at a pH between about 6.0 and about 7.0.
7. A substantially purified and isolated protein fraction, obtained from a composition according to claim 2 , and having at least 50% of its maximal cellulase activity at a pH between about 6.0 and about 7.0. 11. An endoglucanase obtained from a fraction according to claim 7 , having a molecular weight of about 43 kD and a pI of about 3.