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.
Zebrafish development
This film depicts zebrafish (Danio rerio) development from the single-cell stage to hatching.

Elapsed time about 48 hours.
Fertilized zebrafish eggs were mounted in fresh water between a slide and coverslip using a silicon rubber spacer. Images were taken at room temperature on an inverted compound microscope using a 10x DIC objective and digital camera.