The green cell you see here is a killer T-cell
of the immune system, which is attacking the cancerous red and blue cell.
You can tell when the killer T-cell has recognised the cancer cell
because the two dots move around and contact the target.
The killer T-cell then spreads out over the cancerous cell
Passing the video through a filter makes the killer T-cell look yellow
and allows us to really see how it focuses on the cancer cell
These killer T-cell are constantly hunting down dangerous cells throughout the body
and destroying them
