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The expression domain of actc1a is restricted to cardiac and somitic muscle. (A to H) As analyzed by in situ hybridization, actc1a transcript is expressed within the somitic muscle and in the heart tube at the 22-somite (A and B), 24-hpf (C and D), 32-hpf (E and F), and 48-hpf (G and H) stages. At 48 hpf, actc1a cardiac expression becomes enriched in the ventricle (H). (B, D, F, and H) Ventral view of the heart field; the anterior portion is toward the top.
