part of extracellular region apoplast https://github.com/geneontology/go-ontology/issues/31720 The cell membranes and intracellular regions in a plant are connected through plasmodesmata, and plants may be described as having two major compartments: the living symplast and the non-living apoplast. The apoplast is external to the plasma membrane and includes cell walls, intercellular spaces and the lumen of dead structures such as xylem vessels. Water and solutes pass freely through it. cellular_component Wikipedia:Apoplast GO:0048046 cellular anatomical structure