An overview of research on adult stem cells and their role in therapeutic application can be found here:

Maqsood, M. / Kang, M. / Wu, X. / Chen, J. / Teng, L. / Qiu, L. (2020): Adult mesenchymal stem cells and their exosomes: Sources, characteristics, and application in regenerative medicine. In: Life Sciences 256. doi: 10.1016/j.lfs.2020.118002 Online Version 

Liu, S. / Zhou, J. / Zhang, X. / Lin, Y. / Chen, J. / Hu, B. / Song, J. / Zhang, Y. (2016): Strategies to Optimize Adult Stem Cell Therapy for Tissue Regeneration. In: International Journal of Molecular Sciences 17(6), 982. doi: 10.3390/ijms17060982 Online Version