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Time course of iNOS mRNA expression in gill and head kidney of three rainbow trout after i.p. challenge with R. salmoninarum (strain MT 426). Lanes 1, 5 and 9, iNOS transcript in gill; lanes 2, 6 and 10, iNOS transcript in head kidney; lanes 3, 7 and 11, β‐actin transcript in gill; lanes 4, 8 and 12, β‐actin transcript in head kidney. (a) 3 hr after i.p. challenge; (b) 6 hr after i.p. challenge; (c) 12 hr after i.p. challenge.
