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Any constituent part of the cytoplasm, all of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures. Any constituent part of a contractile fiber, a fiber composed of actin, myosin, and associated proteins, found in cells of smooth or striated muscle. A region of the A band in which myosin-binding protein C is located and that can be seen by electron microscopy. This is a functional zone that also includes myosin. Fibers, composed of actin, myosin, and associated proteins, found in cells of smooth or striated muscle. The contractile element of skeletal and cardiac muscle; a long, highly organized bundle of actin, myosin, and other proteins that contracts by a sliding filament mechanism. The midline of aligned thick filaments in a sarcomere; location of specific proteins that link thick filaments. Depending on muscle type the M band consists of different numbers of M lines. The repeating unit of a myofibril in a muscle cell, composed of an array of overlapping thick and thin filaments between two adjacent Z discs. The dark-staining region of a sarcomere, in which myosin thick filaments are present; the center is traversed by the paler H zone, which in turn contains the M line. A relatively pale zone traversing the center of the A band of a sarcomere, visible in relaxed muscle fibers; consists of the central portion of thick (myosin) filaments that are not overlapped by thin (actin) filaments.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: A band
Acc: GO:0031672
Aspect: Cellular Component
Desc: The dark-staining region of a sarcomere, in which myosin thick filaments are present; the center is traversed by the paler H zone, which in turn contains the M line.
Synonyms:
  • transverse disc
  • A disc
  • anisotropic disc
  • Q disc
Proteins in PDR annotated with:
   This term: 43 [Search]
   Term or descendants: 68 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0031672 - A band (interactive image map)
YRC Informatics Platform - Version 3.0
Created and Maintained by: Michael Riffle