From Steve Dent at Engadget:
For the first time, scientists have peered into living cells and created videos showing how they function with unprecedented 3D detail. Using a special microscope and new lighting techniques, a team from Harvard and the Howard Hughes Medical Institute captured zebrafish immune cell interactions with unheard-of 3D detail and resolution. The tech has already yielded new insights on cell function and could transform our understanding of how organisms function at the smallest scales.
…
The stunning result, as shown above, is a live window into immune cell function with ten times more detail than ever seen before. In one shot, an orange-tinted immune cell scoops up blue sugar particles, and in another, a cancer cell attempts to squeeze through a blood vessel wall. The researchers can even “explode” tissue cells to focus on any particular one. More.
See also: RNA molecules recognize each other