Pretty cellular pictures
Electron microscopy for cellular transcription [1]:
Not saying that microscopy pictures are always the most instructive, but I was pleasantly surprised to see that the American Society for Cell Biology has a nice collection of images and videos available free for us online (and thankfully with decent descriptions/pointers).
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[1] © 1969 J. Richard McIntosh. All rights reserved. Reprinted under license from The American Society for Cell Biology.