The brain is only the size of a pea, but looks like a normal brain and has multiple cell types and all the regions of a normal brain - "equal in maturity to that of a five-week-old fetus," according to the report.

They say it could be used as a more effective and more ethical way to test the effects of drug treatments on the brain.

Click here to read more from AFP.

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Yemaya Lyles (right) wipes away tears during a news conference in front of the Rockdale County Public Schools administration building on Tuesday, Dec. 19, 2023. Lyles' son, Antonio, was assaulted by a paraprofessional, who has since been fired and charged with battery. Lyles says her case against the school district has dragged on since then. (Miguel Martinez/AJC 2023)

Credit: Miguel Martinez