They then
put the dishes into special chambers called bioreactors that keep them warm and in gentle motion reminiscent of a womb, encouraging the
cells to form blobs with working neurons and many other features of a full - size
human brain.
Now he and his team are
putting cells from
human brain tumors into the organoids, which have reached the level of development and complexity of a 20 - week - old
human fetus's, to see whether they reprise what happens in patients.