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Echocardiographic observations on embryonic mouse heart during the development. Echocardiographic images obtained on embryonic mice from E8.5 to E17.5 ((c), (f), (i), and (l)) are compared with the gross anatomic observations ((a), (d), (g), and (j)) and histological analyses ((b), (e), (h), and (k)) at the same developmental times. The linear heart tubes observed on mouse embryos at day E8.5 are indicated by an arrow ((a), (b), and (c)). RV, right ventricle; LV, left ventricle.
