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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Tracy Woodard from InTown Cares (left) and Lauren Hopper from Mercy Care organization work with residents at the Copperton Street encampment in August 2024. 
(Miguel Martinez / AJC)

Credit: Miguel Martinez