why do unbilical cord stem cells have greater proliferative capability than embriyonic stem cells?
547979
I dont think there's any evidence to claim that they are at this point. Umbilical cord stem cells do NOT have more capability then embryonic stem cells EVER. Embryonic stem cells are totipotent and umbilical cord cells, which are adult stem cells, are only pluripotent. While they cannot become any cell in the human body as ES cells can, they can become several specialized cells of the cell type they are. since the umbilical cord is used for blood and immunological cells and such, its stem cells can be used to produce more of any of those. This is why umbilical stem cells is commongly used in bone marrow transplants (bone marrow is where the cell components of your blood are created).\n\nThey are also of more use now than embryonic stem cells because we have not yet been able to produce a viable embryonic stem cell line from a cloned embryo. We can easily do it with an embryo which has been donated to research, but the problem there is that the genetic make-up of the embryonic stem cells will be foreign and the same fear of rejection and search for a close-enough match will occur. If stem cells are taken from one's own umbilical cord, it will be of their own genetic make up, thus their own cells.\n\n...This was a very long and possibly confusing answer. I hope it helps anyway. If you have any further questions you can contact me.
899314
http://news.yahoo.com/s/nm/20061105/us_nm/science_stemcells_dc;_ylt=AofB2fvorTCoVtoqyfnKg2nMWM0F;_ylu=X3oDMTA3ODdxdHBhBHNlYwM5NjQ-
866897
Cell division reproduces the same kind of cell.  Cell differentiation is, in embrionic development, the situation wherein cells split-off in different "directions" to become very different things (eg., skin, spleen,...etc.)\n     An editorial:  Stem cell research is investigating the ways that very basics cells (think "undecided") might be introduced and encouraged to grow into cells... organs... to correct some sort of desease or injury.  I think it's a good thing!
520604
i dont' suggest it. do you want to use stem cells to help yourself when they had to kill babies to get it? i wouldn't. i'm sorry for your MS though. truly.
568876
In some countries, it does.  It is illegal to do this in some places.  In China, some experimental spinal cord therapy is being done with aborted fetus stem cells.  There are other sources of stem cells which are used when using abortions is illegal.
955883
This tells you that these cells do not readily divide. So onece there is damage in the spinal cord there are no cell divisions to replace the harmed cells.\n\nCommonly these non-dividing cells are said to be in the G0 phase.
755812
there are 2 types of stem cell used.  one is NOT from embro's and has cured about 100 diseases so far(republican).  the other is from unborn embro's and has cured ZERO diseases(democrat).  Think the chioce is that simple, it is.
1104083
If mothers who just gave birth decide to not keep the stem cells from the umbilical cord (there are programs for that), they should be able to donate them (my cousin wanted to donate them and was not allowed to).
741835
All human beings start their lives from a single cell, called the zygote, which is formed after fertilization. The zygote divides and forms two cells; each of those cells divides again, and so on. Pretty soon, about five days after conception, there is hollow ball of about 150 cells called the blastocyst. The blastocyst is smaller than a grain of sand and contains two types of cells, the trophoblast and the inner cell mass. Embryonic stem cells are the cells that make up the inner cell mass. As embryonic stem cells can form all cell types in an adult, they are referred to as pluripotent stem cells.\n\nStem cells can also be found in very small numbers in various tissues in the adult body. For example, bone marrow stem cells are found in the marrow of the bone and they give rise to all specialized blood cell types. Adult stem cells are typically programmed to form different cell types of their own tissue; they are called multipotent stem cells. Adult stem cells have not yet been identified in all vital organs. In some tissues like the brain, although stem cells exist, they are not very active, and thus do not readily respond to cell injury or damage. Scientists are now also exploring ways in which they can induce the stem cells already present to grow and make the right cell types to replace the damaged ones. \n\nStem cells can also be obtained from sources like the umbilical cord of a newborn baby. This is an accessible source of stem cells, compared to adult tissues like the brain and bone marrow. Although scientists can grow these cells in culture dishes, they can do so only for a limited time. Recently, scientists have discovered the existence of stem cells in baby teeth and in amniotic fluid-the "water bath" that surrounds an unborn baby- and these cells may also have the potential to form multiple cell types. Research to characterize and study these cells is very promising but at a very early stage.
896374
Mainly because embryonic stem cells proliferate (multiply rapidly) for a year or more in the laboratory without differentiating, but most adult stem cells cannot.  Scientists cannot have not determined why this is so but it works to their advantage.
1138603
Actually adult stem cells are MORE versatile than embryonic ones.  At least to date.\n\nVery little has been accomplished w/ embryonic stem cells, while much has been done w/ mature stem cells.\n\nAnd there are no ethical concerns about mature stem cells.
1022139
The natural stem cells have the ability to repair the damage.\n\nRead all the information on my page.
753695
I think the two studies are very important.  Both involve a newly introduced organism into a cell, where it takes over the current cell machinery in order to benefit itself.\n\nDepending on your favorite organism, one takes over the cell's genome, and the other uses your cell as it's new embryonic yolk sac.\n\nThese are pretty impotant processes, considering in the meantime they cause tons of human pathologies.
711160
A stem cell is a basic cell that hasn't quite decided what to become yet.  It is like a cell on standby waiting for orders from the body.  Once the cell gets orders, it goes where it is needed and becomes whatever type of cell the body needs.\n\nWhen a fetus is developing, stem cells become whatever the infant needs based on the DNA code that the mother and father provide.  They become the bones, organs, muscles, brain, hair, etc.  Later in life, stem cells work to repair damage to the body such as bone breaks, cuts, torn ligaments, etc.  This does not mean that aborted fetuses are the primary source of stem cells; it's just one of the most visible ways of seeing how stem cells are used.\n\nMost of the advancements in stem cell research are actually being done with bone-marrow or umbilical cords.  By getting stem cells from adults or umbilical cords, no infants or fetuses need to be harmed.\n\nThe applications of the research are vast.  Scientist hope to be able to repair damaged nerves to cure blindness, deafness and crippling injuries.  There are also ways of using stem cells to stunt the growth of cancers or repair damage to organs.\n\nI hope that was elementary enough.  Stem cell research is really not as bad as everyone makes it seem.  Think about it--if we can cure breast cancer without harming a single child (born or unborn), isn't it worth considering?
33392
Precancerous cells are cells that may, or are likely to, become cancer.\n\nPrecancerous cells have little capacity to repair their DNA and so are more likely to become cancerous.
14531
at this point there are more pros to the research (currently being investigated) but we must be careful not to take away(OR create a market that takes away) a human life inorder to improve our life. thats what people are ultimately afraid of this research turning into.which would be you being cured of a desease by doctors injecting into you part of an unborn dead fetus or a cloned one.
1066657
We asked this question of our son's hemoncologist (a blood and cancer doctor).  Had Joey survived, he would've eventually needed a bone marrow transplant, which is why we asked about it.  The hemonc told us that it was a waste of money.  If you think about it, those cord blood cells have the same genes as the rest of your childs cells, so if something goes wrong in your child, it will go wrong in those cells as well.  As a hemonc, he would never use a child's own cord blood for treatment.  He would always want to use it from a healthy donor.  If you save it, it might be effective some day for use in some other person, but if you're saving it for your own child, you might as well save your money.