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It was observed that superoxide dismutase activity was inversely proportional to the amount of lipofuscin present in the various anatomotopographical areas of the Torpedo marmorata central nervous system. These results support the theory that age pigments are a product of free lipoperoxidation induced by free radicals. [ABSTRACT FROM AUTHOR]

The yellow-brown pigment present in the sensory cells of Aplysia limacina was studied using light and electron microscopy. The ultrastructure, the high carotenoid content and the presence in neurons for which a turnover process has been hypothesized, indicate that these pigments are cytosomes, organelles involved in the production of energy in anaerobiosis. [ABSTRACT FROM AUTHOR]