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Detection of iNOS (a) and β‐actin (b) expression in various tissues of rainbow trout 24 hr after i.p. challenge with R. salmoninarum (strain MT 426). Lanes: 1, blood; 2, gill; 3, gut; 4, head kidney; 5, liver; 6, spleen. Data are for one fish and are representative of the three fish analysed.
