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Transcript
Activated T cells In this video we can see a T cell that becomes activate when interacts with a dendritic cell. The T cell is label with a dye, the fluorescent when it binds calcium ions at the moment the T cell is not activated, its intracellular calcium concentrations are low and so little green fluorescent is visible as the T cell contacts the surface of the dendritic cell. We can see suddenly fluorescent bright green as it becomes activated. How ever is thus continue to move crolling over the surface of the DCs, perhaps to sample the cell display a peptide MHC complexes, eventually the T cell loses interest while is still contact in the DC we can see the fluorescent start to fade, the T cell then migrates away from the dendritic cell.