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Shiga toxin 1a (Stx1a) is expressed at higher levels than Stx2a in wild-type Stx-producing Escherichia coli strains. The mean Stx1a to Stx2a ratio (±SD) for strain 933 was 5.4 ± 0.7, while the mean ratio for strain 2812 was 2.7 ± 0.4. Results are representative of 9 independent cultures from 3 or 4 biological replicates grown for 18–20 hours.
