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wasp

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A stem cell is simply any cell that is capable of differentiating to become one of several specialised cells. There are two main categories of stem cells. There are embryonic stem cells, which are capable of becoming any type of cell. These are called this because they are only found in the embryo.

In adults, we get 'adult' stem cells. These stem cells are already partially differentiated and can only become certain types of cells. As an example, we all carry stem cells in our bone marrow which can differentiate to form any of the different immune system cells but couldn't, for example, form brain cells or toenail secretion cells. By contrast, an embryonic stem cell can eventually form any other type of cell, or an entirely new organism if given the right environment.

In the case of coral polyps, this is a bit confusing. Either the polyps must carry stem cells all the time or he must be undifferentiating existing cells, which is a very difficult thing to do properly. He could also be capturing gametes, but that would probably be even harder.

It would be interesting to watch this and see how it turns out. High metabolic activity isn't always a good thing, even if it lasts for long.

BTW, I suggest people read up a bit on stem cell research. By that I mean _reputable_ reading sources, not poor information dreamed up by political extremists. There are plenty of good, reasoned opinions both supporting and opposing it. There's quite a debate going on about stem cell research ethics and it pays to be informed. I don't know as much as I would like about it, so I'll certainly be reading up on it myself.

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