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Amounts of prostaglandin E2 (PGE2) and nitrogen oxide (NOx) in synovial fluid from osteoarthritic stifle joints. Each point corresponds to the mean (± SD) of 7 dogs for treated group (solid bar) and 8 dogs for control group (open bar). *** indicates a significant difference (P < 0.001) and ** indicates a significant difference (P < 0.01).
