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Fig. 4. Myoglobin is temporally expressed during muscle differentiation. (A)
Immunohistochemical localization of myoglobin in differentiated C2C12
myotubes. Note that myoglobin (green) is uniformly expressed in the cytoplasm
of differentiated myotubes and absent in the nuclear compartment (propidium
iodide stains red and demarcates the nuclear compartment). (B) Western blot
analysis of myoglobin expression following differentiation of C2C12 myotubes.
Myoglobin (Mb) and myosin heavy chain (MHC) proteins increase with exposure of
C2C12 myogenic cell line to differentiation media (DM).