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Figure 2


Fig. 2. First and second heart fields and their contributions to the developing heart. (A) The upper drawings show the relative position, movement and contribution of the second heart field progenitors (green) relative to the first heart field cells (red) from the cardiac-crescent through to the looping stages of mouse heart development. The dashed lines indicate the position of the corresponding sections shown in the lower panels. (B) Location (upper) and contribution (beneath) of the second heart field progenitors (blue) to the outflow tract in the chick embryo. Cranial (Cr)-caudal (Ca), right (R)-left (L), and dorsal (D)-ventral (V) axes are indicated. DOFT, distal outflow tract; HFs, head folds; LA, left atrium; LV, left ventricle; ML, midline; PhA, pharyngeal arches; OFT, outflow tract; POFT, proximal outflow tract; RA, right atrium; RV, right ventricle.





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