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Fig. 4. Formation of the posterior vitelline vein. Time-lapse video-microscopy of a
19 ss chick embryo in ovo (dorsal side upwards). Still images taken at the
indicated time points. Black arrows show the vitelline artery, black
arrowheads the vitelline vein. Red and blue arrows (D-L) indicate direction of
arterial and venous flow, respectively. Venous flow is first detected in F;
there is rapid formation of the vitelline vein (arrowheads, F-L).
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