kgpl at uno.edu wrote:
: ... let's say you take a skin (or whatever) cell from a young
: rat (or human) then wait a few years and take another from the same
: subject. When you put the two cells under a microscope, or do other
: similarly informative biology things with it, what's the difference?
: Is ageing something that takes place at the cellular level all over
: your body, or are there a small number of localized changes that throw
: everything out of kilter? For example, if a young person needs an organ
: replacement, and gets a doner organ from an old person, does the organ
: "become young" again in the young person, or does it stay old and not
: last very long? And is this true of every kind of organ replacement?
Or, more specifically, do the follicle cells for a grey hair have the
same DNA as the follicle cells for a normally pigmented hair taken
from the same individual on the same day?
Bob Walsh (walshb at alumni.caltech.edu)
Santa Fe, NM, USA (505) 263-1875
FAX: (505) 983-5868