Cellulase is an enzymes produced mainly by fungi , bacteria , and some protozoans via catalyzation of the cellulolysis of cellulose . They are also produced by some plants and animals. There are different kinds of cellulases known, on basis of their diverse structure and composition. EC 3.2.1.4 . is the EC number of this group of enzyme. The alternative names for cellulase include endo-1,4-beta-glucanase, carboxymethyl cellulase (CMCase), endo-1,4-beta-D-glucanase, Beta-1,4-glucanase, Beta-1,4-endoglucan hydrolase and Celludextrinase.