Lymphoma cells in motion (fresh from the brain)

These human lymphoma cells were injected into the tailvein of a mouse, and 6 weeks later the mouse started holding its head strangely, diagnostic that the lymphoma cells had entered the central nervous system (CNS); this is time-lapse. These cells have been out of the brain maybe 1-2 hr; the whole thing only takes 15 min, so it is way speeded up. Some cells increase their length by 2 to 3-fold sending out "protrusions".