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. 2012 Jun;18(6):1002–1004. doi: 10.3201/eid1806.111421

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BsrDI digest of tprI and BsrDI/BsEI double digest of tprC from the oral ulcer swab specimen and the syphilis control strain Nichols. Lanes from left to right: 1, 100-bp ladder; 2, Nichols tprI product not digested with BsrDI (493-bp band); 3, clinical specimen tprI product digested with BsrDI (334-bp and 159-bp bands); 4, Nichols tprC digested with BsrDI/BsiEI (547-bp and 160-bp bands); 5, clinical specimen tprC digested with BsrDI/BsiEI (547-bp and 160-bp bands).