Listeria monocytogenes moving in PtK2 cells (from the Theriot Lab)

"These pathogenic bacteria grow directly in the host cell cytoplasm. The phase-dense streaks behind the bacteria are the actin-rich comet tails. Actin-based motility is also used in cellular motility; this cell is using it's cytoskeleton to crawl toward the lower right-hand corner.  Speeded up 150X over real time." Julie Theriot & Dan Pornoy

Listeria monocytogenes moving in Xenopus extract (from the Theriot Lab)

"Listeria monocytogenes bactera moving in a cytoplasmic extract. On the left is the phase-contrast sequence to show the bacterium moving. On the right is a simultaneously recorded fluorescence sequence, showing the distribution of fluorescently-labeled actin. Speeded up 60X." David Fung

A single ActA-coated bead moving in Xenopus extract (from the Theriot Lab)

"Here, a .5-micron bead coated with ActA moves in extract. The phase image of the bead has been superimposed over the fluorescent image and appears as a red circle. Speeded up 60X." Lisa Cameron & Julie Theriot