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There are several stages in the development of lysosomes in the endomembrane system.
At which point do lysosomes become mature?
When late endosomes acidify to activate the acid hydrolases.
When acid hydrolases are packaged into vesicles and bud off the trans Golgi.
When material is digested and sorted and buds off the lysosome.
When early endosomes fuse with endocytosed vesicles.