Assertion: muscle fiber's muscle | /r/HasProperty | johnson et al.
Facets:
Source sentences:
text: The proportions of type I, IIA and IIB fibers within an individual subject vary between muscles (e.g., Johnson et al., 1973), within regions of a single muscle (Elder et al., 1982), and even within a single muscle fascicle (Sjöström et al., 1986).