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Yield and viability of PBMC isolated by the Ficoll and CPT protocols. a The mean numbers of PBMC per ml of blood obtained by Ficoll or CPT isolation procedure from 6 healthy donors. b The mean viability of PBMC freshly isolated from the same 6 healthy donors by either Ficoll gradient separation or CPT technique. No significant differences (P < 0.05) in PBMC yield or viability between the two isolation protocols were found. Error bars indicate standard error of the mean
