Fig. 4. Multiple lineages arise from the lateral marginal zone. Although we did not score non-cardiac lineages thoroughly, we noted the origins of some frequently detected cell types. (A,C,E,G) Lateral views at 44 hpf, anterior towards the left, showing examples of labeled cells (arrows). (B,D,F,H) Fate maps indicating experiments in which labeled blastomeres gave rise to head vessels, circulating blood cells in cranial locations, pharyngeal pouches or pectoral fin mesenchyme. Progenitors for head endothelium (A,B) and presumed myeloid cells (C,D) are found 45-100° from dorsal in tiers 1 and 2. Progenitors for pharyngeal pouches (E,F) and pectoral fin mesenchyme (G,H) are found 50-150° from dorsal in tiers 1-4.