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Laboratory ELISPOT spot-forming unit (SFU) counts for each donor PBMC sample in response to specific stimuli in panels 1 to 3. SFU counts shown for CEF and CMV peptides and PHA were determined by subtracting background values and are presented per 106 PBMC. Each box plot represents all results for a single donor. A single observation represents the mean response from one lab and one operator.
