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Extracellular protein profiles of 18-h-old planktonic cells grown in the absence of glass wool (a) and combined PGW-biofilm cells (b) of B. cereus DL5 following separation by one-dimensional SDS-12% PAGE and silver staining. A BENCHMARK prestained protein ladder (GIBCO BRL) was used as the molecular weight (MW) marker (lane M). Unique bands are indicated by arrows.
