membrane-enclosed lumen
   |__organelle lumen
       |__intracellular organelle lumen  1546 rec.
           |__acidocalcisome lumen
           |__cytoplasmic vesicle lumen 1 rec.
           |   |__aleurone grain lumen
           |   |__clathrin-sculpted acetylcholine transport vesicle lumen
           |   |__clathrin-sculpted gamma-aminobutyric acid transport vesicle lumen
           |   |__clathrin-sculpted glutamate transport vesicle lumen
           |   |__clathrin-sculpted monoamine transport vesicle lumen
           |   |__COPI-coated vesicle lumen
           |   |__COPII-coated vesicle lumen
           |   |__cytolytic granule lumen
           |   |__esterosome lumen
           |   |__Golgi-associated vesicle lumen
           |   |__melanosome lumen
           |   |__phagolysosome vesicle lumen
           |   |__plasma membrane-derived thylakoid lumen
           |   |__secretory granule lumen(+) 1 rec.
           |   |__spine apparatus lumen
           |   |__synaptic vesicle lumen
           |   |__transport vesicle lumen(+)
           |__endocytic vesicle lumen
           |   |__clathrin-coated endocytic vesicle lumen
           |   |__phagocytic vesicle lumen(+)
           |__endoplasmic reticulum lumen 18 rec.
           |   |__cortical endoplasmic reticulum lumen
           |   |__perinuclear endoplasmic reticulum lumen
           |   |__rough endoplasmic reticulum lumen
           |   |__sarcoplasmic reticulum lumen(+)
           |   |__smooth endoplasmic reticulum lumen
           |__endosome lumen
           |   |__early endosome lumen
           |   |__endolysosome lumen
           |   |__late endosome lumen(+)
           |   |__recycling endosome lumen
           |__ficolin-1-rich granule lumen
           |__Golgi lumen
           |   |__Golgi stack lumen
           |   |__trans-Golgi network transport vesicle lumen
           |__gut granule lumen
           |__hydrogenosome lumen
           |__magnetosome lumen
           |__microbody lumen 3 rec.
           |   |__peroxisomal matrix(+) 3 rec.
           |__microneme lumen
           |__mitochondrial matrix 379 rec.
           |__multivesicular body, internal vesicle lumen
           |__nuclear lumen 1106 rec.
           |__organelle envelope lumen 51 rec.
           |   |__mitochondrial intermembrane space 49 rec.
           |   |__nuclear envelope lumen 2 rec.
           |   |__plastid intermembrane space(+)
           |__platelet dense tubular network lumen
           |__tertiary granule lumen
           |__vacuolar lumen 2 rec.
               |__autolysosome lumen
               |__autophagosome lumen
               |__azurophil granule lumen
               |__cytolytic granule lumen
               |__fungal-type vacuole lumen
               |__lysosomal lumen(+) 2 rec.
               |__phagolysosome vesicle lumen
               |__plant-type vacuole lumen(+)