Pretty interesting photos - guess you would need an electron microscope or something like that for this sort of work...
Fascinating stuff Don! Do they colour these in or something? I imagine the electron microscope would show stuff in black and white?
I seem to remember seeing something similar, when the parts were coloured artificially. I think in PP after the shot. Still pretty good macro though.
They use genetic dyes. These are scientific photos. They want to show existing structures.