Fig. 6From: Spatial compartmentalization of free radical formation and mitochondrial heterogeneity in bivalve gills revealed by live-imaging techniquesRepresentative DCF fluorescence patterns in M. edulis gills (ROS/RNS formation). a1: overview of filamental structure, a2: corresponding transmission image. b: DCF fluorescence intensity profile across a gill filament. Black box indicates the limits of blood sinus. Outer and inner region of epithelial cells were defined for statistical purposes as described in the method section. c1: view of the ventral bends with subepithelial mucus glands containing mucus vacuoles (white arrows) and corresponding transmission image (c2). Bs = blood sinus, ore = outer region of epithelial cells, ire = inner region of epithelial cells, ROI = region of interest. Scale bars = 50 μmBack to article page