part of vacuolar lumen autophagosome autophagosome lumen GO:0034423 autophagic vacuole lumen cellular_component The volume enclosed within the autophagosome double-membrane. Note that this term should be used for annotating gene products with caution: it should be used only to annotate gene products demonstrated to reside and function normally in the autophagic vacuole lumen, not for molecules that are temporarily found in the lumen prior to degradation.