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Example of the electrophoresis patterns generated by RAPD amplification of some ECOR collection strains and E. coli K-12 with primers A1 and A7. The molecular size marker used is a 1-kb ladder (Gibco BRL, Life Technologies Ltd.). The strain number is indicated above each lane, and the primer used is shown below. Arrows point to some of the fragments used as hybridization probes in dot blot analysis.
