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Lysosomes are membrane-bound acidic organelles that degrade cargoes derived from endocytosis, phagocytosis or autophagy through the action of a variety of lysosomal hydrolases.The degradation products are exported from lysosomes by membrane transporters for the reutilization in cellular metabolism.Defects in either lysosomal hydrolytic enzymes or exports of hydrolysis products lead to inherited lysosomal storage disorders, indicating the importance of lysosomes in cellular homeostasis.