Autophagy delivers a biological cell's own material for digestion and recycling in lysosomes. Macroautophagy is the enclosing-carrier route illustrated here; other forms deliver cargo differently. The cargo's internal origin distinguishes this route from uptake by endocytosis.[ref]
Protein Degradation. The Cell: A Molecular Approach, 2nd edition by Geoffrey M. Cooper; Lysosomal Proteolysis, Figure 7.41 and subsequent selective-uptake paragraph: enclosed cargo and alternative uptake
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