FB2025_05 , released December 11, 2025

CV Term Report

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General Information
Term	base	ID (Ontology)	SO:0001236 (Sequence Ontology)
Definition	A base is a sequence feature that corresponds to a single unit of a nucleotide polymer.
Comment
Links to External Ontologies
	SO.org
Annotations
Records annotated with this term OR any of its CHILD TERMS
Results list data from multiple species. Click on a button above and use the 'Filter by species' options on the resulting HitList to retrieve species-specific data.
Records annotated with this exact term (annotations to child terms are NOT included)
No relevant records available
Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
No relevant statements available

Spanning Tree (Parents/Children)

  region
   |__biological_region
       |__base  2004 rec.
           |__modified_DNA_base
           |   |__methylated_DNA_base_feature(+)
           |   |__modified_adenine(+)
           |   |__modified_cytosine(+)
           |   |__modified_guanine(+)
           |__modified_RNA_base_feature 2004 rec.
               |__inosine(+)
               |__modified_adenosine(+)
               |__modified_cytidine(+)
               |__modified_guanosine(+)
               |__modified_uridine(+)
               |__ribothymidine
               |__seven_methylguanine

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	biological_region
Part of
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts
	http://en.wikipedia.org/wiki/Nucleobase "wiki"