If you read my first comment you might be left wondering what are exosomes exactly? Scientific American did an excellent article on exosomes check it out? For those who are curious https://www.scientificamerican.com/custom-media/nature-outlook-extracellular-rna/inside-the-stem-cell-pharmaceutical-factory/

And in this podcast they interviewed the scientist who treated these spina bifida babies with placenta derived mesenchymal stem cells, according to the scientist in the future they intend to try this same surgery with stem cells on babies with spina bifida that have already been born, they think these stem cells can possibly help a baby with spina bifida that's already been born, and they might even try these stem cells on people with spinal cord injury, you know paralyzed people. It seems these placenta derived stem cells are pretty dang revolutionary.

https://www.ucdavis.edu/news/podcasts-and-shows/unfold/hope-spina-bifida-cure-part-2