In lysosomal digestion, residual bodies are vesicles containing indigestible materials.[1] Residual bodies are either secreted by the cell via exocytosis (this generally only occurs in macrophages), or they become lipofuscin granules that remain in the cytosol indefinitely. Longer-living cells like neurons and muscle cells usually have a higher concentration of lipofuscin than other more rapidly proliferating cells.
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editKarp, Gerald (2005). Cell and Molecular Biology: Concepts and Experiments. Hoboken, NJ: John Wiley & Sons. pp. 311–313. ISBN 0-471-46580-1.