Mini-brains have been fused to resemble that of a 40-day-old fetus

Human “mini-brains” that contain 80 per cent of the cell types in a 40-day-old fetal brain have been created by fusing different organoids together.

“We’re getting to the point that we are getting closer to the fetal brain,” says Annie Kathuria at Johns Hopkins University in Maryland. The reason for doing this is to create organoids that are better suited for studying conditions such as autism and schizophrenia, which is hard to do in animals, she says.