Final answer:
Cell differentiation is the process by which unspecialized cells become specialized cells. Stem cells can differentiate into different types of cells within a given cell lineage. Human embryonic stem cells (hESCs) can differentiate into specialized cells characteristic of all three germ layers.
Step-by-step explanation:
Cell differentiation is the process by which unspecialized cells become specialized cells. Stem cells, which are unspecialized cells, have the potential to differentiate into different types of cells within a given cell lineage. The differentiation of stem cells can be induced in the laboratory by changing the physical and chemical conditions of growth. For example, human embryonic stem cells (hESCs) can differentiate into specialized cells that are characteristic of all three germ layers.