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. 2015 Sep 17;10(9):e0138370. doi: 10.1371/journal.pone.0138370

Fig 2. Determination of cutoff value.

Fig 2

Twenty seven zebra serum samples were tested with either (A) EHV-9_G or EHV-1_E (B) peptides. OD values above the black line are considered positive, while OD values below the dashed line are considered negative. OD values between the lower and upper cut-offs were considered as questionable.