FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term I band ID (Ontology) GO:0031674 (Gene Ontology)
Definition A region of a sarcomere that appears as a light band on each side of the Z disc, comprising a region of the sarcomere where thin (actin) filaments are not overlapped by thick (myosin) filaments; contains actin, troponin, and tropomyosin; each sarcomere includes half of an I band at each end.[ ISBN:0321204131 ]
Also Known As "I disc" ; "isotropic disc" ; "J disc"
Comment
Links to External Ontologies
  QuickGO data     AmiGO data
Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN       8
Genes (FBgn)  GO_CELLULAR_COMPONENT       4
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       3
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Constructs
 I band (all annotations which use CV term, excluding "NOT" statements)       8      4      3
     I band | larval stage       4       --       3
     I band | progressive       1       --       --
     I band | third instar larval stage       2       --       2
     located_in | I band       --       4       --
Spanning Tree (Parents/Children)
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  cellular_component
   |__cellular anatomical structure
       |__I band  658 rec.
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Is a cellular anatomical structure
Part of sarcomere
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Synonyms
  • "I disc" EXACT
    "isotropic disc" EXACT
    "J disc" EXACT
Secondary IDs
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Wikipedia:Sarcomere#bands