cell death

LJ Smith ljsmith at flash.net
Thu May 27 01:22:01 EST 1999

I have a question (actually 2) that is probably so elementary it might make 
some of you laugh, but working the premise that there are no stupid 
here goes.
Assuming that cells are "programmed" to undergo a certain number of divisions 
and then they die, how is it that we have a continuous amount of cells to 
replace the dead ones, such as with skin cells?  Where do these "fresh" cells 
come from?  
If you start with a single cell that undergoes mitosis and you now have 2 
cells, each with its own genome, did the repicated chromatids assort in such a 
manner that some of the original strands and some of the replicated strands 
end up in both cells?
Does a renewable source of young cells arise from some type of stem cell?

These are a couple of those questions that I have consistently tucked away to 
be contemplated at a later date. 

                        L.J. Smith

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