- Áú¹®³»¿ë - Could you ask him to call me? vitalex usa After 15 to 20 days, the tissue formed minibrains called cerebral organoids, each enclosing a fluid-filled region, much like the cerebral ventricles that contain cerebrospinal fluid in the human brain. After 20 to 30 days, some of the organoids formed defined brain areas, including a cerebral cortex (the brain's complex outer layer); retinal tissue, the light-sensitive part of the eye; meninges, the membranes that envelope the brain; and choroid plexus, which produces the cerebrospinal fluid that bathes the brain.
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