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PERSPECTIVE
1 Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA; 2 Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA; 3 Department of Medicine and Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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The vertebrate heart is initially formed from two lateral domains of cardiogenic mesoderm that fuse at the ventral midline to form a simple heart tube that is similar to the hearts or dorsal vessels of invertebrates. As development proceeds, this initial heart tube undergoes a series of morphogenetic rearrangements that subdivides the heart into the distinct chambers found in adult vertebrates. In this issue of Genes & Development, Chi et al. (2008)
describe a novel transcriptional pathway required for separation of the outflow (ventricular) portion from the inflow (atrial) portion of the two-chambered zebrafish heart. This separation takes place
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