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IL-12 (a) and IL-10 (b) levels and IL-12/IL-10 ratio (c) in whole blood cultures. The cytokine levels were detected by ELISA assays on whole blood culture supernatants from 10 control donors, seven patients with low-grade squamous intraepithelial lesions (SIL) and 20 patients with high-grade SIL. The IL-12/IL-10 ratio is expressed by mean ±s.e.m. *P < 0·05; **P < 0·01.
