Drosophila hemocytes disperse over the entirety of the developing embryo. This protocol demonstrates how to mount and image these migrations using embryos with fluorescently labelled hemocytes.
Evans, I. R., Zanet, J., Wood, W., Stramer, B. M. Live Imaging Of Drosophila melanogaster Embryonic Hemocyte Migrations. J. Vis. Exp. (36), e1696, doi:10.3791/1696 (2010).