Activated T Cell

In this video, we can see a T cell becomes activated when its interact with Dendritic cells (DCs).The T cell is labeled with a dye that fluoresce when its bind calcium ion. As the T cell contacts the surface of dendritic cells we can see suddenly fluoresce a bright green when it gets activated.However it still continues to move crawling over the surface of dendritic cells.Eventully the T cell loses interest,while it still contacting the dendritic cells you can see floresence starts to fade.the T cell then migrates away from dendritic cells