Where do stem cells come from?

Stem cells can come from various sources, including:

1. Embryonic stem cells:

These stem cells are derived from embryos that are typically created for in vitro fertilization purposes. They are obtained from the inner cell mass of the blastocyst stage of the embryo.

2. Adult stem cells:

These stem cells are found in various tissues and organs of the body, such as bone marrow, blood, skin, brain, and liver. They are responsible for repairing and replenishing cells in their respective tissues.

3. Umbilical cord blood stem cells:

These stem cells are collected from the umbilical cord and placenta after a baby is born. They are rich in hematopoietic stem cells, which can differentiate into various blood cell types.

4. Induced pluripotent stem cells (iPSCs):

These stem cells are generated by reprogramming adult cells, such as skin cells, to revert them back to a pluripotent state similar to embryonic stem cells. This reprogramming is typically achieved by introducing specific genes or proteins into the cells.

5. Amniotic fluid stem cells:

These stem cells are found in the amniotic fluid surrounding a developing fetus. They can differentiate into various cell types and are considered a potential source of stem cells for therapeutic purposes.

It is important to note that the use of embryonic stem cells is a topic of ethical debate due to the destruction of embryos involved in their extraction.

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