Fig. 7. The relative expression of (A) nNOS (N=10) and (B) eNOS (N=7) protein in the PCV of rainbow trout (Oncorhynchus mykiss) that were either subjected to 4 days of repeated hypoxia or continued normoxia. Values are shown as means ± s.e.m. An asterisk denotes a significant difference (P<0.5) between the control and hypoxia-treated groups.