Herbert Levine and Wouter-Jan Rappel
This video shows a Dictyostelium discoideum cell moving in a 2-µm-deep chamber with a chemical gradient directed to the right; the chemical concentration increases by 5% across the length of the cell's body. The cell includes a green fluorescent marker that reveals activated Ras protein. Total time elapsed is about 10 minutes.
![](https://s2.save4k.ru/pic/hgxcImlzDCc/mqdefault.jpg)