Ultimately their genetics. However various genes get turned off at programmed times by methylation of the DNA while others get turned on at programmed times by demethylation of the DNA. The methylated/demethylated forms of the DNA are passed on to the stem cell's descendants so they "retain their programmed state" and thus their identity following differentiation. Some of this program control is influenced by the concentrations of various chemicals secreted by other cells in the vicinity of the stem cell or its descendants.
Stem cells in human bone marrow can divide and differentiate to form various types of blood cells, such as red blood cells, white blood cells, and platelets.
The basal layer of the epidermis contains stem cells that continuously divide and differentiate to produce new epidermal cells. These stem cells are responsible for regenerating the skin's outer layer.
Sometimes the bird is able to develop a new migratory pattern, but often the bird will become confused, lost and die as a result. Stem cells are biological cells found in all multicellular organisms, that can divide (through mitosis) and differentiate into diverse specialized cell types and can self-renew to produce more stem cells. www.stem-cell-regeneration.com/about
Stem cells do not necessarily grow faster than cancer cells. Cancer cells can divide more rapidly and uncontrollably than stem cells, which can contribute to the aggressive nature of cancer growth. However, stem cells have the ability to divide and differentiate into various cell types, while cancer cells typically lose this ability.
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Stem cells in human bone marrow can divide and differentiate to form various types of blood cells, such as red blood cells, white blood cells, and platelets.
The basal layer of the epidermis contains stem cells that continuously divide and differentiate to produce new epidermal cells. These stem cells are responsible for regenerating the skin's outer layer.
Sometimes the bird is able to develop a new migratory pattern, but often the bird will become confused, lost and die as a result. Stem cells are biological cells found in all multicellular organisms, that can divide (through mitosis) and differentiate into diverse specialized cell types and can self-renew to produce more stem cells. www.stem-cell-regeneration.com/about
Stem cells do not necessarily grow faster than cancer cells. Cancer cells can divide more rapidly and uncontrollably than stem cells, which can contribute to the aggressive nature of cancer growth. However, stem cells have the ability to divide and differentiate into various cell types, while cancer cells typically lose this ability.
Dead or damaged cells are replaced by nearby healthy cells that divide and multiply to fill in the empty space. In some cases, stem cells can also differentiate into the specific cell type needed to replace the damaged cells.
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To understand potency we jave to know that the Potency of a stem cell relates to its ability to differentiate. Currently the most potent cell lines are: • Totipotent stem cells that can differentiate into embryonic and extraembryonic cell types. • Pluripotent cells can differentiate into nearly all cells. • Multipotent cells can differentiate into a number of cells, but only those of a closely related family of cells • Oligopotent cells can differentiate into a few cell types like myeloid stem cells • Unipotent cells can only produce one cell type, themselves. source:http://stemcellthailand.org/differentiation/
They were at one point, but as they grow they differentiate and can no longer be counted as stem cells.
Stem cells can divide and renew themselves for long periods of time, remain undifferentiated in form, and can develop into a variety of specialized cell types.
Unipotent
embryonic stem cells can differentiate into more types of cells
They can differentiate into more cells than adult stem cells can.