Brent Meeker writes:
> Russell Standish wrote:
> > The NS article is
> > issue 2556 of New Scientist magazine, 19 June 2006, page 50
> > the actual published work is
> > Cell, vol 122, p 133
> > What he measured was the age of carbon in DNA, which is only a tiny
> > fraction of the total number of atoms making up a cell. So I guess you
> > are right in your more restricted meaning of "same".
> > Cheers
> I wonder what part of neuron remains over a long period time. I can well
> the electrolytes and other components that are part of the metabolic cycle
> over fairly quickly. But what about the structural protiens that give shape
> to the
> axons? What about the myline sheath? Do they really turn over quickly too?
All cellular components are continuously being repaired and replaced, including
ones. I am not sure of the actual figures for individual components in human
probably protein turnover has a haf-life of days. For example, experiments with
tyrosine suggest that half the protein in a mouse brain turns over every ten
Jesse Mazer quoted a study a while ago suggesting that turnover of synaptic
was even more rapid, a matter of minutes, but I cannot find the reference.
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