anatomical entity A part of a cellular organism that is either an immaterial entity or a material entity with granularity above the level of a protein complex. Or, a substance produced by a cellular organism with granularity above the level of a protein complex. CARO:0000000 Following BFO, material anatomical entities may have immaterial parts (the lumen of your stomach is part of your stomach). The granularity limit follows the limits set by the Gene Ontology on the granularity limit for GO:cellular_component. Note that substances produced by an organism (sweat, feaces, urine) do not need to be part of an organism to qualify as an anatomical structure. material anatomical entity immaterial anatomical entity biological entity