Embryonic stem cells are described as pluripotent because they can differentiate into multiple cell types. From which source do they originate?

Embryonic stem cells are described as pluripotent because they can differentiate into multiple cell types. From which source do they originate?

• A. Embryonic (pluripotent)
• B. Hematopoietic stem cells
• C. Cord blood stem cells
• D. Aborted 2nd trimester fetuses

Answer: (A)

Embryonic stem cells come from early embryos, specifically from the inner cell mass of a blastocyst. This early-stage tissue retains the potential to become any cell type in the body, which is why these cells are pluripotent. From this source, they can differentiate into cells across all three germ layers, giving rise to nearly any body tissue while not forming extraembryonic structures like the placenta. Other listed sources are more restricted: hematopoietic stem cells from bone marrow or blood are multipotent and mainly produce blood and immune cells; cord blood stem cells are also primarily hematopoietic; tissue from later fetuses (such as second-trimester) is not the standard source for embryonic stem cell lines and involves different considerations.

Embryonic stem cells come from early embryos, specifically from the inner cell mass of a blastocyst. This early-stage tissue retains the potential to become any cell type in the body, which is why these cells are pluripotent. From this source, they can differentiate into cells across all three germ layers, giving rise to nearly any body tissue while not forming extraembryonic structures like the placenta.

Other listed sources are more restricted: hematopoietic stem cells from bone marrow or blood are multipotent and mainly produce blood and immune cells; cord blood stem cells are also primarily hematopoietic; tissue from later fetuses (such as second-trimester) is not the standard source for embryonic stem cell lines and involves different considerations.