Figure 1. Stem cell differentiation process.
This is the differentiation tree of stem cells from zygote to progenitor cell. Progenitor cells are unipotent stem cells that have the weakest capacity for differentiation and replication. In the mesoderm, endothelial progenitor cells, neural progenitor cells, pancreatic progenitor cells, and cardiac progenitor cells are involved. A multipotent stem cell is a monibus term; in the mesoderm, mesenchymal stem cells, hematopoietic stem cells, neural stem cells, and skin stem cells are involved. iPSCs are manufactured stem cells, and this type of pluripotent stem cell possesses functions similar to those of traditional pluripotent stem cells.