Fig. 2. Developmental expression of MyHC transcripts in the myotome detected by in situ hybridization. Staged embryos were hybridized with probes specific for sMyHC1, 2, 3 or efast MyHC. The number of somites expressing MyHC was plotted against the total number of somites that had formed in that embryo. efast MyHC (black, open square) was the first myosin expressed, followed a few hours later by nearly simultaneous expression of sMyHC1 (blue circle) and sMyHC3 (red square). There was a significant delay before the expression of sMyHC2 (green triangle).

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