<unk>  are the mixture of stem<unk>  that can be obtained from the<unk>  fluid as well as the<unk>  membrane. They can develop into various tissue types including skin, cartilage, cardiac tissue, nerves, muscle, and bone. The<unk>  also have potential medical applications, especially in organ regeneration. The stem<unk>  are usually extracted from the<unk>  sac by amniocentesis which occurs without harming the embryos. The use of<unk>  fluid stem<unk>  is therefore generally considered to lack the ethical problems associated with the use of<unk>  from embryos. In 2009, the first US<unk> bank was opened in Medford, MA, by Biocell Center, an international company specializing in the cryopreservation and private banking of<unk>  fluid stem<unk> .
Amniotic stem cells
Neural stem cell
Embryoid body
Progenitor cell
Extravillous trophoblast
Syncytiotrophoblast
Cytotrophoblast
Hemangioblast