Introduction: Cell Motility
All cells show some ability to move at some stage of their lives. Some cells are highly active, such as immune system cells and amoebae. The basis for all cell movement arises from the cell’s internal skeleton that is made of proteins called tubulin and actin. Using structures made from these proteins, cells can move internal material, divide, crawl, and swim.
Mouse embryonic stem cells - movie 2
Mouse embryonic stem cells move, grow, and divide in culture.

This movie was taken over a 12-hour period.
Pluripotent mouse embryonic stem cells were cultured using standard techiniques. For imaging, cells in suspension were transferred to small, sterile plexiglass chambers attached to a coverslip. Cells were maintained on an inverted compound microscope in an environmental chamber kept at 37°C, 7.0% CO2. Images were taken with a 40x phase contrast objective and a digital camera.