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Fig. 2 The expression of slow and fast myosin heavy chains in zebrafish. a,b,d-f: Expression of smyhc1. g-l: Expression of myhc4. All views are dorsal. a: Expression is clearly visible in the adaxial cells of the formed somites and also of the presomitic mesoderm at both seven-somite stages. b-d: Single confocal sections at the 10-somite stage showing smyhc1 expression (b) and expression of F59 (c) demonstrating colocalization in the adaxial cells (d). e: Adaxial expression is maintained at the 13-somite stage. f: At the 28-somite stage expression is seen in the lateral slow muscle postmigration and in the most posterior somites in the adaxial and migrating slow muscle. g: Expression of myhc4 in the adaxial cells and presomitic mesoderm at the seven-somite stage. h-j: Single confocal images of myhc4 expression (h) together with F59 (i) demonstrating adaxial cell localization (j). k: Expression is maintained in the adaxial cells at the 13-somite stage. l: At 17-somites just after migration of the slow muscle initiates, the expression domain expands to include the fast muscle.