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PFGE profiles of genomic DNAs from N. meningitidis C:2b:P1.5 strains after digestion with endonuclease NheI. The lambda ladder DNA marker (New England Biolabs) (lane MW) was used as a molecular size standard (48.5 kb). Lane 1, pulse type PTA; lane 2, PTA1; lane 3, PTA2. The arrows identify the band differences.
