Fig. 5. (A ) Northern blot hybridization using the synthesized cDNA probes for rat induced nitric oxide synthase (iNOS). (B ) Relative radioactivity of iNOS mRNA to ribosomal RNA, which were measured by imaging analyzer (BAS 2000). *P < 0.01 versus control; #P < 0.05 versus interleukin (IL)-1β; n = 6 each. HAL = halothane.