NOVELTY - Cell comprising a recombinant nucleic acid sequence encoding an endoglucanase 1b (EG1b) protein comprising SEQ ID NO: 2 (a 463 amino acid sequence fully defined in the specification) and an operably-linked heterologous promoter, is new, where the cell further produces at least one recombinant cellulase protein comprising beta-glucosidases (BGLs), type-1 cellobiohydrolases (CBH1s), type-2 cellobiohydrolases (CBH2s), glycoside hydrolase 61s (GH61s) and/or endoglucanases (EGs).    USE - The cell is useful: in saccharification reaction (claimed) for hydrolyzing cellulose to form smaller oligosaccharides, disaccharides and monosaccharide; for the production of fermentable sugars from cellulosic biomass; for production of sugar (e.g. glucose syrups), biofuels production, textile treatment, pulp or paper treatment; and in detergents or animal feed.    ADVANTAGE - The cells have improved protein secretion, protein stability and/or other properties desirable for expression and/or secretion of a protein.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a composition comprising the EG1b protein, and one or more cellulases proteins;    (2) a recombinant nucleic acid sequence encoding a protein comprising SEQ ID NO: 2;    (3) a vector comprising the recombinant nucleic acid;    (4) a host cell comprising the vector;    (5) a method of saccharification, comprising either (a) culturing a cell under conditions in which the EG1b protein is secreted into a culture broth, and (b) combining the broth and a biomass under conditions in which saccharification occurs, where the step (a) may take place before or simultaneously with step (b), or the step (a) as above per se, isolating the EG1b from the broth, and combining the isolated EG1b protein and biomass under conditions in which saccharification occurs; and    (6) a method-1 for reducing viscosity during saccharification reactions, comprising providing EG1b in a saccharification reaction mixture under conditions such that the viscosity of the saccharification reaction mixture is less viscous than a saccharification reaction mixture without the EG1b.