The ontologies and relations referred to in the Dendritic Cell Ontology (DC-CL). The rectangles and ovals represent ontologies, and the arrows represent relations joining terms in the ontologies. Abbreviations for the ontology names are shown in normal font, and the relations used to link DC-CL to each ontology are shown in italics. The black arrow indicates relations used to join DC-CL terms to other DC-CL terms, while the blue arrows indicate trans-ontological relations. Ontologies and relations shown in rectangles are used to define DC-CL types, while the ontologies and relations shown in ovals are used to make non-classificatory assertions about DC-CL types. Abbreviations used in the figure are: GO CC, Gene Ontology Cellular Component Ontology; PRO, Protein Ontology; IO, Immunology Ontology; FMA, Foundational Model of Anatomy; and GO BP, Gene Ontology Biological Process Ontology.