(A-B') Lateral (A) and ventrolateral (B, B') images of the cranial vessels in kdrl:nlsKaede;kdrl:EGFP embryos, with unconverted tissue shown in green (A-B) while photoconverted tissue is shown in red (B'). The early kdrl-positive VA-L was photoconverted in 34 hpf embryos (A), and followed through to 54 hpf (B, B'). B' is a higher magnification image of the box in B and is accompanied by a red channel only (traced photoconverted cells) image with the VA-L (dotted line) demarcated from the adjacent VA. The VA-L photoconverted cells are indicated by arrowheads. 