Figure 2. Stages of cardiac mesoderm and heart tube assembly.

Figure 2

Stages of cardiac mesoderm and heart tube assembly. A) Side view of heart field at late stage 11 germ band extension. B) Side view of heart progenitors at stage 13 germ band retraction. C) Dorsal view of bilateral rows of cells in the process of migration towards the midline (arrows). D) Dorsal view of the heart after assembly.

From: Development of the Cardiac Musculature

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