TIL about Brainbow.

Brainbow is the process by which individual neurons in the brain can be distinguished from neighboring neurons using fluorescent proteins. By randomly expressing different ratios of red, green, and blue derivatives of green fluorescent protein in individual neurons, it is possible to flag each neuron with a distinctive color. This process has been a major contribution to the field of connectomics, or the study of neural connections in the brain.

http://en.wikipedia.org/wiki/Brainbow

Image: Cerebral cortex of a mouse Brainbow-labelled.

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