precursor cell

A progenitor cell is a type of cell that is in the process of differentiating into a specialized cell type. These cells are more developed than stem cells but have not yet reached their final, specialized form. Progenitor cells are crucial in the development of multicellular organisms, as they give rise to the various tissues and organs with specific functions.1

During embryonic development, progenitor cells arise from stem cells and undergo further divisions, becoming increasingly specialized with each round. This process culminates in terminal differentiation, where cells acquire their unique characteristics and typically stop dividing.1

The three primary germ layers formed during embryonic development—ectoderm, mesoderm, and endoderm—are composed of lineage-specific stem cells that give rise to progenitor cells. These progenitor cells then differentiate into specific tissue types. For example, ectodermal derivatives include the nervous system, while mesodermal derivatives form muscle and bone, and endodermal derivatives contribute to the lining of the digestive tract and lungs.2