Abstract
By means of histochemical and electron-microscopic techniques, two pigments were identified in the brown body of the earthworm Eisenia fetida andrei. Lipofuscin, often called the aging pigment, was the more abundant pigment and the first to be synthesized. Melanin was also found but was only present in the mature brown body. A computer-assisted image analysis was used to quantify the relative abundance of the two pigments at different stages of the formation of the brown body. A previous study showing phenoloxidase activity in the coelomocytes and the present demonstration of the ability of these cells to produce reactive oxygen systems when agglutinated can be correlated with the simultaneous presence of the two pigments in the brown body. The physiological significance of pigment synthesis by brown bodies is discussed with respect to the immune response in earthworms.
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Valembois, P., Seymour, J. & Lassègues, M. Evidence of lipofuscin and melanin in the brown body of the earthworm Eisenia fetida andrei . Cell Tissue Res 277, 183–188 (1994). https://doi.org/10.1007/BF00303095
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DOI: https://doi.org/10.1007/BF00303095