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Presence of apoptotic cells (AC) in skin sections. (a) TUNEL-stained fin whale skin showing AC (round-stained nucleus indicated by arrows) throughout the epidermis (category 3 AC; bar = 100 µm). (b) TUNEL-stained sperm whale skin with category 2 AC (bar = 100 µm). Melanin pigments are seen as black granular material. (c) Prevalence and categories of AC in blue whales (pale grey bars, n = 18), sperm whales (dark grey bars, n = 11) and fin whales (black bars, n = 14). Bars = ±s.e.m.
