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Figure 4.

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Lymphocyte proliferation responses (mean SI index + S.E.). Lymphocytes isolated from blood in week 0 (black bar), after the third immunization (white bar), 1 week after challenge (grey bar) and 4 weeks after challenge (chequered bar) and lymphocytes isolated from the lymph nodes 4 weeks after challenge (striped bar) with H. contortus were stimulated with con A (a) and total ES (b).

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