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Gel electrophoresis for the results of the polymerase chain reaction (PCR) amplification of the 731-bp fragment using the bcsp31 gene for Brucella melitensis. Lanes L to 4: 100-bp DNA ladder; lane 1: Brucella melitensis Rev1 and vaccine strain (positive control); and lanes 2, 3, and 4: specimens whose results were positive by PCR.
