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Fig. 5. Light micrographs of gills stained for (a-c) S-phase cells (BrdU) and (d-f) apoptotic cells (TUNEL). Picture series starts with normoxia (a,d), 3 days of hypoxia (b,e) and 7 days of hypoxia (c,f). Arrows point out some of the stained cells seen on the micrographs. ILCM, interlamellar cell mass. Scale bar, 50 µm.