This video shows the T cells (purple dots) attacking the pancreatic islets
(green images in center), which contain the insulin‑producing beta cells.
(Beta cell destruction leads to type 1 diabetes). The squiggly "tail" on
the T cells, which switches from blue to red to yellow, is a tracking
mechanism inserted by the researchers to record the T cell's velocity and
attack time. The attack continues over several hours before a number of
beta cells are destroyed.