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Photographs of head lice immersed in ethanol (first row), in dimeticone/cyclomethicone (second row) or in water (third row). Dark-blue stained ethanol entered across spiracles and filled the respiratory system (a, b, c), control (d). Red-stained dimeticone/cyclomethicone entered across spiracles and filled the respiratory system (e, f, g), control (h). Dark blue stained water did not penetrate the respiratory system (i, j, k), control (l).
