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Defective heart development in pbx2-MO; pbx4-MO embryos. (A–B) Lateral views of live (A) wild-type and (B) pbx2-MO; pbx4-MO embryos at 48 hpf. pbx2-MO; pbx4-MO embryos show mild pericardial edema and blood pooled near the atrium (arrow). Anterior is to the right. a, atrium. v, ventricle.