In vitro fertilization is a procedure that childless couples may use when they are having trouble conceiving the natural way. It is the next step after artificial insemination has failed to yield the desired result. The IVF procedure involves fertilization of the woman's eggs in a petri dish and then implanting the resulting embryos. Unused embryos are a byproduct of this process. There are a number of different ways of dealing with these and it is the responsibility of the parents to determine what happens to them.
Once the eggs are fertilized, spare embryos that are not implanted may be frozen and stored. With modern vitrification freezing techniques, these living embryos may remain viable for years. Parents may decide to store them for future use, donate them for pioneering stem cell research, donate them to other couples who are unable to create their own embryos, continue to store them year after year or they may choose to have them destroyed.
Stem cells are undifferentiated cells at an early stage of development. They have the potential to differentiate into other types o f mature cell. This is referred to as pluripotency. Stem cells are becoming increasingly useful as a medical treatment for all sorts of conditions. Because this procedure is open to serious abuse, it is tightly regulated.
Scientists at a Utah university first injected stem cells into the hearts of patients as a therapeutic strategy for heart failure. Cells were derived from the patient's bone marrow and then cultured for just short of two weeks. Those that survived in tissue culture became stronger than the patient's original bone marrow. These cells were then placed into the left side of the patients' hearts.
Stem cells were first isolated from mice in 1981 and in humans in 1998. Some are derived from human embryos that were not used in IVF, although there are other sources. Stem cells may also be harvested from umbilical cords, bone marrow and peripheral blood. Stem cells have shown promise in treating many different medical conditions. These include cancer, neurological disorders and diabetes.
Bone marrow comes from rich deposits deep inside the larger bones of the human body, most notably the pelvic bone. This process is very painful so it is performed under a general anesthetic. A wide-bore needle is injected into the hip and then into the bone marrow from which the tissue is collected.
Under normal physiological conditions, peripheral blood does not contain vast numbers of stem cells. Loading the donors with hormonal growth factors leads to a notable increase in the numbers of these cells. Neonatal blood is teeming with stem cells. Those remaining in the umbilical cord are removed and stored at extremely low temperatures, as low as -200 Kelvin and reserved for transplantation at a later date or until the parents decide what to do with them.
Once the parents are sure they do not want any more children, there are a number of things they can decide to do with the extra embryos. They may donate them for research, discard them or allow them to be passed on to other childless couples who are unable to conceive by other methods.
Once the eggs are fertilized, spare embryos that are not implanted may be frozen and stored. With modern vitrification freezing techniques, these living embryos may remain viable for years. Parents may decide to store them for future use, donate them for pioneering stem cell research, donate them to other couples who are unable to create their own embryos, continue to store them year after year or they may choose to have them destroyed.
Stem cells are undifferentiated cells at an early stage of development. They have the potential to differentiate into other types o f mature cell. This is referred to as pluripotency. Stem cells are becoming increasingly useful as a medical treatment for all sorts of conditions. Because this procedure is open to serious abuse, it is tightly regulated.
Scientists at a Utah university first injected stem cells into the hearts of patients as a therapeutic strategy for heart failure. Cells were derived from the patient's bone marrow and then cultured for just short of two weeks. Those that survived in tissue culture became stronger than the patient's original bone marrow. These cells were then placed into the left side of the patients' hearts.
Stem cells were first isolated from mice in 1981 and in humans in 1998. Some are derived from human embryos that were not used in IVF, although there are other sources. Stem cells may also be harvested from umbilical cords, bone marrow and peripheral blood. Stem cells have shown promise in treating many different medical conditions. These include cancer, neurological disorders and diabetes.
Bone marrow comes from rich deposits deep inside the larger bones of the human body, most notably the pelvic bone. This process is very painful so it is performed under a general anesthetic. A wide-bore needle is injected into the hip and then into the bone marrow from which the tissue is collected.
Under normal physiological conditions, peripheral blood does not contain vast numbers of stem cells. Loading the donors with hormonal growth factors leads to a notable increase in the numbers of these cells. Neonatal blood is teeming with stem cells. Those remaining in the umbilical cord are removed and stored at extremely low temperatures, as low as -200 Kelvin and reserved for transplantation at a later date or until the parents decide what to do with them.
Once the parents are sure they do not want any more children, there are a number of things they can decide to do with the extra embryos. They may donate them for research, discard them or allow them to be passed on to other childless couples who are unable to conceive by other methods.
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