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Table 1 Six subclasses of part-whole relationships

From: The Sequence Ontology: a tool for the unification of genome annotations

Part_of subtype Whole Properties of relationship Example
component_part_of integral object Functional/heteromerous/separable A leg is a part_of a body.
A regulatory_region is a part_of a gene.
portion_part_of mass Not functional/homomerous/separable A slice is a part_of a cake.
A restriction_fragment is part_of a chromosome.
stuff_part_of object Not functional/heteromerous/not separable Carbon is a part_of a chromosome.
member_part_of collection Not functional/heteromerous/separable A sheep is a part_of a flock.
A read is a part_of a contig.
place_part_of area Not functional/homomerous/not separable England is a part_of Britain.
feature_part_of activity Functional/heteromerous/not separable Inhaling is a part_of breathing.
Translation is part_of protein synthesis.
  1. Column 1 gives the name of the subclass; column 2, the class or 'whole' to which such parts belong; column 3, the essential properties that define that particular part-whole relationship; and column 4 provides examples. Of the six classes only two - component_part_of and member_part_of occur in SO.