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A coloured scanning electron micrograph of the head of a human flea (Pulex irritans)
Brain's wiring seen in Technicolor
Brainbow! In addition to being pretty, this method of labeling individual neurons in different colors helps us understand how brain cells develop and form circuits.
This neuronal stem cell culture shows a rainbow of differentiation, with fluorescent tags that separate stem cells (orange/yellow) from their neuronal "offspring" (blue/green/purple).