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RAPD profiles of poultry-source E. coli isolates refractory to macrorestriction analysis. Lane numbers are shown below image. According to analysis with RAPD primers 1254 and 1281 (as listed above the gel lanes), Nal-resistant (R) isolates (isolates 407, lanes 1 and 4; and 467, lanes 3 and 6) are indistinguishable from Nal-susceptible (S) isolate 372 (lanes 2 and 5), within the reproducibility limits of RAPD analysis.
