Frozen in action, killer T cells appear remarkably alive as they attack a cancer cell. Several of the normally round T-cells acquire the elongated shape of active fighters as they subject their target to chemical attack, breaking down the cell membrane.
Each kidney contains thousands of glomeruli, tiny knots of blood vessels that filter large molecules out of urine. Fractal branching patterns in the circulation of blood inside the kidney ensure that the filtration process is as efficient as possible.
Coloured SEM of a cultured cancer cell moving through a hole in a support film. Numerous pseudopodia, fillipodia and surface blebs can be seen and are characteristic of highly mobile cells which enable them to metastasise rapidly.