Rolling of leukocytes on the walls of the caudal vein in a larval zebrafish; real time. As in adult mammals, such rolling occurs only in veins, not in arteries. Video made available by Mark Cooper th...

Phagocytosis of injected live E. coli and B. subtilis by early macrophages in the yolksac blood circulation valley; real time. A macrophage loaded with B. subtilis bacteria now phagocytoses an erythro...