Fig. 6. Secondary sprouts contribute to either intersegmental veins or parachordal vessels. Blood vessels on the left side of the trunk were imaged in two separate Tg(fli1:EGFP)^y1 animals at 1.8 and 2.2 dpf (A) or 1.9 dpf (B) and the final AV identity of each intersegmental vessel was determined at 7 dpf. The data for trunk vascular wiring are presented schematically. Horizontal lines show the dorsal aorta (red), posterior cardinal vein (blue) and parachordal segments (gray). Vertical lines show primary segments (red), secondary segments connecting to form intersegmental veins (blue), and secondary segments forming ventral parachordal roots or whose fate has not yet been determined (gray). Connections to intersegmental vessels are noted with black rings; vessels depicted as crossing one another without a black ring are adjacent, but not connected. Asterisk notes the lone ISA that did form a connection to the parachordal system. See text for additional details.

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