Tight junctions (blue dots) between cells are connected areas of the plasma membrane that stitch cells together. Adherens junctions (red dots) join the actin filaments of neighboring cells together.

If cells are removed from the embryo they will differentiate into any cell type. These are called embryonic stem cells. Some stem cells remain in the bodies of adults as adult stem cells.

Quiescent stem cells (d) through asymmetric division probably give rise to more ... All these progeny cells have defined positions in the different organs. To maintain its function and continue ...