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Electrophoresis of myosin extracts from myotubes growing on microcarriers. MyHC of the control on day 24 (lane 1) and day 29 (lane 2) and isoform pattern of the Ca2+ ionophore A23187 (4 × 10−7 M) treated cells after 2 (lane 3) and 7 days (lane 4) of incubation.
