Assertion: muscle fiber's myofibril | /r/HasProperty | composed
Facets:
value: of alternating bands
type: OTHER
value: of repeating sections of sarcomeres
type: OTHER
Source sentences:
text: Myofibrils are composed of repeating sections of sarcomeres, which appear under the microscope as alternating dark and light bands.
text: The myofibril is composed of alternating bands.