Fig. 5. Reconnection of disconnected arterial capillaries to the venous system. Still images of time-lapse video microscopy of a 30 ss chick embryo in ovo taken at the indicated time points. Red and blue arrows indicate direction of arterial and venous flow, respectively. (A-I) There are blood filled `spots' at both side of the vitelline artery (VA). Venous flow at this stage is only detected in two small veins (blue arrows). Sprouts originating from these `spots' cross over the VA (D-H, black arrows). As soon as the sprouts connect to the vein, the blood filled `spots' are flushed out (compare H with I, black arrows). The same process can be observed more distally (compare J-L, black arrows). Scale bar: 455 µm.