Fig. 4
From: Detection and Differentiation of the Six Brucella Species by Polymerase Chain Reaction

Detection limit of PCR
PCR results using decreasing amounts of DNA of B. abortus (Bv. 1) (as an example of all Brucella species) and B. suis (Bv. 1). Lane M, molecular size standard (pBR322/AluI).