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Illustrative examples of dose-response curves obtained with interleukin-29 (IL-29) preparations coded A (closed circles) and B (open circles) using different IL-29 assays. Human NCTC2544 keratinocyte cell line-based antiviral assay (a), human HEK ISRE SEAP-based reporter gene assay (b), human HEP2G carcinoma cell line-based antiviral assay (c), reporter gene assay using transfected human HuH7 cells harboring interferon (IFN)-regulated firefly luciferase construct (d).
