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Pulsed field gel electrophoresis of strains of methicillin resistant Staphylococcus aureus (MRSA). DNA from 18 MRSA isolates digested with SmaI and separated at 6 V/cm for 22 hours with a switch time of 5–25 seconds. Lane marked M, Lambda DNA ladder. Isolates 1–5, 7–15, 17 and 18 showed identical patterns.
