FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
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"
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Direct annotations: records annotated with this exact term (child terms are NOT included)
Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Genes (FBgn)GO_CELLULAR_COMPONENT
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Constructs
 I band (all annotations which use CV term, excluding "NOT" statements)
     I band | larval stage
      --
     I band | progressive
      --       --
     I band | third instar larval stage
      --
     located_in | I band       --
      --
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cellular_component
 |__cellular anatomical structure__
myofibril                          |
 |__sarcomere______________________|
cellular anatomical structure      |
 |__sarcomere______________________|
                                   I band  654 rec.
                                    |__Z disc 649 rec.
                                        |__titin-telethonin complex
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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