How to build a human brain
Some steps for growing mini versions of human organs are easier than others

BRAIN-MAKING 101 As blobs of two types of brainlike tissue fuse, interneurons (green) migrate from the left clump to the right, linking with neurons (not stained) in the right blob. On both sides, neural support cells called glia appear in purple.
Paşca Lab/Stanford Univ.
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