Assertion: muscle fiber's filament | /r/HasProperty | bound to proteins of the m line
Facets:
value: by the large protein
type: OTHER
value: to the z discs
type: LOCATION
Source sentences:
text: Thick filaments are myosin bundles that span the A line and are bound to proteins of the M line (M band) and to the Z discs across the I bands by the large protein called titin.