Secreted endoglucanase activity from 16 thermophilic fungi grown on microcrystalline cellulose. Endoglucanase activity of secreted fungal enzymes was measured as described in “Methods”. The left y-axis indicates the scale for the upper panel including endoglucanase activities from all the fungi and the right y-axis indicates the scale for the lower panel. The endoglucanase activity from T. leycettanus is truncated. Error bars indicate standard deviations. See Table 1 for abbreviations of fungal names. The figure represents the result of triple determination of the enzyme activity for each culture in one growth experiment. The growth experiment was repeated twice with similar results.