Fig. 4

Comparison between PeriO and Biological Process ontology in GO (GO-BP). The classes of PeriO can be mapped to the classes of Biological Process in GO (GO-BP) with ‘is_a’ or ’has_part’ relationships. This indicates that PeriO defines more specific concepts specific to tissues and cells as well as contexts of periodontitis than GO-BP. The classes in PeriO are characterized by causal (‘preceded by’) relationships in series, which represents the significance of secession among processes and of consequence of the successive processes resulting in a disease-state