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Northern blot of a dilution series of cold-shocked Y. enterocolitica mRNA (10°C, 30 min) detected by using the A1-probe. The relative amounts of bi- and monocistronic mRNA from cspA1/A2 were determined with the software Image Master 1D Elite (Amersham Pharmacia Biotech). The bicistronic mRNA shows a 300-fold increase; the monocistronic one shows a 30-fold increase.
