How are stem cells extracted?

2 ways: Stem cells are obtained through a series of bone marrow aspirations, usually from the posterior superior area of the pelvis. They can also be collected by peripheral blood collection from a vein usually in the arm. Hope this helps.

Depends on cell type: There are a variety of stem cell types, including embryonic, which reside in a 4 day old embryo; vs.adult stem cells, which reside in mature tissues. Bone marrow stem cells are the only type in routine use and may be harvested from marrow aspirations, peripheral blood mobilization, or umbilical cord blood. Induced progenitor cells may be made in the lab from other cell types through gene therapy.

STEM CELLs: STEM CELLs can be extracted from bone marrow, fat tissue, umbilical cord blood, limbal stem cells for cornea procedures. Embryonic stems cells have been shown to not be as helpful a hoped. Adult stems cells are safer.