I don't do much experimentation, but I am pretty sure that you can very easily distinguish individual atoms with electron beam microscopy, and get pretty close using atomic force microscopy. And I am not sure what exactly is the resolving power of synchrotron radiation, but I expect if to be pretty high.
However, the breakthrough here seems being able to do so using a low-energy electron beam. All the methods I quoted above are probably impractical or damaging with biological samples.
However, the breakthrough here seems being able to do so using a low-energy electron beam. All the methods I quoted above are probably impractical or damaging with biological samples.