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Effect of Echinacea preparations on (A) splenic and (B) blood lymphocyte proliferation. The lymphocyte proliferation assay was conducted as described in Materials and Methods. Results were expressed as cpm (3H incorporation) × 103 and are presented as mean ± SE values of two independent experiments (n = 6). Numbers in parentheses are the concentration of each mitogen (in μg/mL). *Significant difference from vehicle control at P < .05.
