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Table 1 Examples of relationships used in the ZFA and ZFS

From: The zebrafish anatomy and stage ontologies: representing the anatomy and development of Danio rerio

Property Explanation Examples
is_a (subclass in OWL) Subtypes a class by its intrinsic nature. The heart is_a cavitated compound organ.
part_of (BFO:0000050) Describes what structure or system the class is a part of. The heart is part_of the cardiovascular system.
develops_from (RO:0002202) Describes a class by its progenitors. The heart develops_from heart tube.
start_stage (RO:0002091) Describes a class that is observed to begin during a particular stage. The heart has a start_stage of Pharyngula:High-pec
end_stage (RO:0002093) Describes a class that is observed to end during a particular stage. The heart has an end_stage of Adult
immediately_preceded_by (RO:0002087) Describes the order in which process classes occur in time. Pharyngula:High-pec is immediately_preceded_by Pharyngula:Prim-25