[dekhn]

Yeah, exactly that, but with kinesin instead of dynein (everybody started with myosin, but loss interest, and moved to kinesin and then dynein) and about 10 years earlier.

Those little blobs moving along the filaments are ~10-100 nanometers, you wouldn't normally be able to see them, but they managed to tether fluorescent (glowing) molecules to them and those act like point sources of light, which allows for precise localization because the PSF of a point is approximately gaussian and finding the centroid of a gaussian is trivial.