In Article <4obmf2$4kq at alpha1.chapman.edu>, hrolson at nexus.chapman.edu
(Howard R. Olson) wrote:
> I need a review article on the "RNA world" hypothesis. I hope it will
>be as current as possible but must have something in at least the past 5
>or 10 years.
> The question I am most interested in are possible estimates of how
>long it took DNA to evolve from RNA. The two obvious steps are the reduction
>of ribose and methylation of Uracil to form Thymine. Were there any other
>considerations that might have lengthened the time for evolution of DNA
>from the RNA World?
You may want to Medline search Juergen Brosius, whose review articles are
R.M. Bernstein PhD
Dept of Micro/Immuno
University of Arizona
Ph: 520 626 2585
Fx: 520 626 2100