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. 48. A method of saccharification of cellulose, comprising treating the cellulose with an isolated cellulase enzyme of claim 13 having at least 50% of its maximal cellulase activity at a neutral and/or alkaline pH, whereby the cellulose is hydrolyzed.