Effect of rPA
on the expression of CD38 in PBMCs: Cells were incubated with rPA20 for 16 hours. Cells were then centrifuged and incubated with allophycocyanin (APC)-conjugated mouse anti-human CD38 monoclonal antibody. Samples were loaded onto a cell chip which determined cell associated fluorescence. Data are expressed as percent of CD38 fluorescent cell compared to total cell number (+/- standard deviation) and represent the results of three separate experiments performed in triplicate.