13. A substantially purified and isolated neutral and/or alkaline cellulase enzyme, isolated from a protein fraction according to claim 7 , and having a pI of between about 3 and about 5.5.
13. A substantially purified and isolated neutral and/or alkaline cellulase enzyme, isolated from a protein fraction according to claim 7 , and having a pI of between about 3 and about 5.5. 14. A cellulase according to claim 13 wherein said cellulase possesses either endoglucanase or cellobiohydrolase activity.