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Figure 1. The ontologies. Here, sections of the three ontologies are represented schematically with only term names shown. The biological process ontology is shown on the left side (dark blue background), the molecular function ontology is shown in the center (light blue background), and the cellular component ontology is shown on the right side (yellow background). More general concepts are at the top and the more specific ones are at the bottom. The is_a relationships (continuous black lines) indicate that a child concept is a type of the parent concept, and the part_of relationships (dashed black lines) indicate that the child concept is a part of the parent concept. A term may have multiple parent terms, as in the case of adaxial/ abaxial axis specification. Separately and in parallel with the development of the GO, gene products are annotated (red lines) to the terms. Annotation indicates that the gene product (gray background, black outline) is involved in the process described, or that it has the function, or acts in the location described.