Table 3. Reactivity of monoclonal antibodies to myosin heavy chain (MHC) isoforms and identification of muscle fiber types

Antibodies Muscle fiber types
I (MHC slow/I) I+IIA (MHCs I/slow & 2a) IIA (MHC 2a) IIA+IIX (MHCs 2a & 2x) IIX (MHC 2x) IIX+IIB (MHCs 2x & 2b) IIB (MHC 2b)
Bovine skeletal muscles in cocktail
 BA-F8 +++
 SC-71 +++ ++ +(+)
 BF-35 ++ +++ +
 6H1 + ++ +++
Porcine skeletal muscles in cocktail
 BA-F8 +++
 SC-71 ++ +++ + + +
 BF-35 +++ +++ +
 BF-F3 + +++
Porcine skeletal muscles in a series
 BA-F8 +++
 SC-71 +++ ++ + +
 BF-35 ++ +++ +
 BF-F3 + +++
Positive reactivity: +, weak; ++, moderate; +++, strong. Negative reactivity: −.