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CD70 expression on NK cells following short-term in vitro culture of PBMC with or without IL-7. PBMC from patients and controls were cultured for 8 days in RPMI medium alone (untreated) or in the presence of 25 ng/ml IL-7 (IL-7-treated). PBMC were collected on day 8 and stained for CD70 expression. Bars represent the mean ± standard deviation.
