part of start stage end stage dorsal aorta portion of tissue hematopoietic system ventral wall of dorsal aorta ZFA:0005028 aorta gonad mesonephros region DP joint Region where blood progenitor markers are expressed. Probable site of definitive hematopoiesis between 36hpf and 4dpf. DA-PCV joint DA roof zebrafish_anatomy TAO:0005028 dorsal aorta - posterior cardinal vein joint AGM segmentation:26+ somites adult