Experiments were carried out to determine the specificity and cross-reactivity for the measurable body fluid samples (i.e.peripheral blood, semen, and saliva). Fig. 2 illustrates the range of
average expression levels, based on RFUs, of each marker relative to the body fluid stain tested. First, the ALAS2 peripheral blood-specific marker was detected in peripheral blood stains from all donors tested. None of the other markers were detected in peripheral blood stains (Fig. 2A).