NOVELTY - A cellulase variant, where the variant is a mature form having cellulase activity and comprising a substitution, is new.    USE - The cellulase variant is useful for cleaning or fabric care, depilling and surface finishing a fabric, converting biomass to sugars, and producing a fuel (all claimed).    ADVANTAGE - The cellulase exhibits improved expression, activity and stability.    DETAILED DESCRIPTION - A cellulase variant, where the variant is a mature form having cellulase activity and comprising a substitution at one or more positions selected from: 5, 18, 19, 28, 30, 32, 35, 38, 79, 80, 89, 100, 102, 103, 104, 105, 111, 117, 119, 121, 125, 126, 133, 137, 138, 139, 140, 141, 143, 150, 158, 162, 177, 180, 181, 182, 185, 186, 188, 190, 191, 192, 193, 196, 201, 207, 225, 226, 228, 229, 230, 233, 234, 236, 240, 243, 245, 251, 252, 258, 267, 268, 274, 292, 293, 303, 304, 306, 307, 313, 319, 322, 328, 331, 338, 340, 346, 361, 362, 363, 364, 365, 371, 384, 394, 396, 400, 406, 407, 414, 417, 422, 427, 431, 433, 436, 440, 441, 443, 444, 445 and 447, where the positions are numbered by correspondence with the amino acid sequence of a reference cellobiohydrolase II (CBH2) set forth as fully defined 448 amino acids (SEQ ID NO. 3) , is new. INDEPENDENT CLAIMS are:    (1) a composition comprising the cellulase variant;    (2) an isolated nucleic acid encoding the cellulase variant;    (3) an expression vector comprising the isolated nucleic acid operably linked to a regulatory sequence;    (4) a host cell comprising the expression vector;    (5) a method for producing a cellulase variant;    (6) a method of cleaning or fabric care comprising contacting a surface or an article comprising a fabric with the composition;    (7) a method for depilling and surface finishing a fabric comprising contacting a surface or an article comprising a fabric with the composition;    (8) a method for converting biomass to sugars comprising contacting the biomass with the composition; and    (9) a method for producing a fuel comprising: contacting a biomass composition with an enzymatic composition comprising the cellulase variant to yield a sugar solution; and culturing the sugar solution with a fermentative microorganism under conditions sufficient to produce a fuel.