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Explanation of relationship types

Various relationships and their reciprocal types are shown between anatomical structures.

Has subtype and is a type of
Structure B is a type of structure A. Structure A has subtypes B and C.
premaxillary tooth is a type of: tooth
tooth has subtypes: dentary tooth, premaxillary tooth, vomerine tooth
Is part of and has part
Structure B is a part of structure A during the time at which they both exist. Structure A may have a part B during the time at which they both exist.
premaxillary tooth is part of: premaxilla
premaxilla has parts: premaxilla ascending process, premaxillary tooth
Structure B overlaps structure A if both structures share an unnamed part.
hyomandibula overlaps hyomandibula-metapterygoid joint
Develops from and develops into
Structure A develops from structure B. Structure B develops into structure A. There can be a one to one, one to many, or many to one correspondence. For example, Structure A develops from structure B and C, or structure A develops into structure B and C.
hyomandibula develops from: hyosymplectic cartilage
hyosymplectic cartilage develops into: hyomandibula, symplectic
These relationships are representations of formal types described by the OBO-REL ontology.