Assertion: muscle fiber's filament | /r/CapableOf | extend into the a band
Facets:
value: toward the m-line
type: LOCATION
Source sentences:
text: The thin filaments extend into the A band toward the M-line and overlap with regions of the thick filament.
text: filaments, the thin filaments, are the major component of the I-band and extend into the A-band.