Why does medicine consider the study of stem cells one of its most important tasks?

The study of stem cells is the most important task of the XXI century. What are these stem cells? The process of histogenesis begins in the embryo. Histogenesis is the process that enables tissue creation. Several types of cells are involved in this process: stem, semi-stem, and mature. Stem cells are not differentiated. In fact, in the future they can become any kind of cells. If scientists can find a way to create stem cells, then our body can regenerate. These cells can replace damaged or dead cells in the body, which is very important for the development of medicine.