Fig. 1.

Arterial pole progenitors at 40% epiboly. Fate map of arterial pole progenitors in the zebrafish embryo at 40% epiboly. Shown are the first four tiers of the lateral marginal zone (LMZ) for the left and right sides of the embryo, dorsal to the right (0°). The equatorial circumference of the embryo has been divided into 3° segments, each segment corresponding approximately to a single cell diameter. The fate map is presented with the embryo flattened for simplicity. Dots represent experiments in which caged fluorophores were activated in single cells and colors indicate the position of their progeny at 72 hpf.