Figure 2From: Logical Development of the Cell OntologyNeed for new cell types indicated during generation of computable definitions. (a) The CL class "hematopoietic stem cell" and its computable definitions with the PRO ontology. New is_a subtypes of hematopoietic stem cell are created to represent species-specific expression of protein types. Abbreviations for protein types are used for clarity. (b) General hematopoietic progenitor cell types with characteristics shared by many species appear in the middle. Sub-types of progenitor cells classified by human-specific cell surface markers appear on the left and sub-types with mouse-specific cell surface markers appear on the right. Note that a developmental lineage of species-specific cell types can be determined by following the develops_from relationships.Back to article page