SCENE-shared subject identity.
Bases: Lookup
Extensible vocabulary for Subject.kind — insert a row to add a kind.
The built-in kinds are class attributes, e.g. SubjectKind.MOUSE.
Bases: Manual
Individual identity (human, mouse, other), registered by one lab.
subject_id is minted by register_subject; the lab refers to the
subject by subject_code, which is unique within that lab. The code is
a pseudonym: never a real name, initials, birth date or other identifying
information (it is shared with the consortium).