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Fig. 6. An ED 9.5 lumen. The primary heart tube is shown in purple, and the left and right ventricles (LV and RV) and mostly obscured left and right atria (LA and RA) are depicted in gray. These reconstructions support the ballooning-heart model (3, 5) in which the chambers are thought to "balloon" out of the primary tube, as opposed to the textbook model of heart development, the so-called segmental model.

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