Endohydrolysis of (1->4)-beta-D-glucosidic linkages in cellulose, lichenin and cereal beta-D-glucans. Used as a detergent cellulase. Sold under the name Celluzyme by Novozymes. This special enzyme has three effects: colour brightening, softening and removal of particulate soil. The overall effect is that it helps to preserve the nice appearance of new fabric and restores old fabric so that it looks new again. Belongs to the glycosyl hydrolase 5 (cellulase A) family.