F. Pedrosadomellof et al., ELECTROPHORETICALLY DEFINED MYOSIN HEAVY-CHAIN PATTERNS OF SINGLE HUMAN MUSCLE-SPINDLES, FEBS letters, 335(2), 1993, pp. 239-242
At least four myosin heavy chain (MHC) isoforms were separated by SDS-
PAGE in extracts of intrafusal fibers isolated by microdissection from
human lumbrical muscles. The fastest migrating MHC represents a slow
isoform. The slowest migrating MHC was identified as the embryonic MHC
(emb) A faint band, moving slightly faster than MHC(emb) most likely r
epresents a neonatal/fetal MHC isoform. A prominent band, moving betwe
en the latter and the slow isoform is suggested to represent a hithert
o unidentified, spindle-specific MHC isoform, MHC(if).