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D. rerio gill apparatus in basal conditions: (A) SEM micrographs showing concentric microridges of pavement cells (PVCs). F = filament and L = lamellae. Bar 50 µm; (B) light micrographs in toluidine blue showing general morphological organization of branchial epithelium; F = filament and L = lamellae. Bar 50 µm.
