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(A) Inhibition of toxin blastogenesis of PBMCs by protein A-enriched anti-peptide antibody. PBMCs (2 × 105) were stimulated with either 2 μg of each toxin or a combination of 2 μg of each toxin with anti-peptide antibody. These cells were incubated for 6 days, and the results were measured via tritiated thymidine incorporation. cpm, counts per minute. (B) Note the lack of inhibition of blastogenesis when a high-titered group A carbohydrate antibody (Ab) was used in the assay.
