https://newatlas.com/biology/lab-grown-mini-brain-organoid-eye-see/ https://newatlas.com/biology/lab-grown-mini-brain-organoid-e... >Using stem cells from four

https://newatlas.com/biology/lab-grown-mini-brain-organoid-eye-see/ https://newatlas.com/biology/lab-grown-mini-brain-organoid-e... >Using stem cells from four donors, the team made 314 brain organoids in 16 batches, with around 72 percent of them forming optic cups. These structures began to appear by the 30-day mark and matured within 50 days, which the team says is a similar time frame to when human embryos develop retinas. The study shows that the technique is reproducible, although further work will need to be done to keep them viable for longer, in order to use them for study.