The type of stem cells that can only develop into cells that are closely related to the original stem cell are called "unipotent" stem cells. These stem cells have the ability to differentiate into only one type of specialized cell, which is usually the same as the cell type from which they originated.
For example, a myoblast is a type of unipotent stem cell that can only develop into muscle cells. Similarly, a spermatogonial stem cell is a type of unipotent stem cell that can only develop into sperm cells.
Unipotent stem cells are different from "pluripotent" stem cells, which have the ability to differentiate into many different types of specialized cells. Pluripotent stem cells can give rise to cells from all three germ layers, which are the ectoderm, endoderm, and mesoderm. Embryonic stem cells and induced pluripotent stem cells are examples of pluripotent stem cells.