This image sequence shows a biosensor made from the tiny fluorescent probes of jellyfish. By using this with two‑photon fluorescent imaging microscopy, we can see cancer cells deep inside living tissue.
The two-photon microscope moves from the outside of the tissue towards the inside. The glow-in-the-dark pancreatic tumour (green) is surrounded by the collagen matrix (purple).
![](https://s2.save4k.ru/pic/fshNdab7d1g/maxresdefault.jpg)