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Single colonies of a mutagenized culture of C. thermocellum enriched for nonadsorbing cells. Colonies on the turbid cellulose background produce a dark halo when degrading cellulose. The bar indicates a length of 1 cm. Colonies with different sizes and abilities in cellulose hydrolysis can be recognized. Two colonies with reduced cellulose-degrading ability (putative mutants) are indicated by arrows.
