Cell System Ontology  
Class: ExternalReferenceBase
Annotation
1. Definition: The same to BioPAX. A pointer to an external object, such as an entry in a database or a term in a controlled vocabulary.
2. Instantiation: FALSE
3. Comment: This class is for organizational purposes only.
Concept Hierarchy
Super class
CSMLBase
Sub classes
DataSource
Xref
Properties
Datatype property
Object property
COMMENT
Instances

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