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Multiplex polymerase chain reaction (PCR) products on a 2% agarose gel. Beijing strains generated 129-bp and 523-bp fragments. Non-Beijing strains generated 95-bp and 523-bp fragments.
Lanes 1: 100-bp DNA ladder;
2: Mycobacterium tuberculosis H37Rv;
3, 6, 7, 9, 11, 12 and 14: non-Beijing strain;
4, 5, 8 and10: Beijing strain; Lane 13: Distilled water blank control
