The equation in the sentence "Under a neutral model of evolution,
sa0 is one randomly selected sequence, and
E[d(sa0,s1)]
= E[d(s0x,
s0y)] where the right-hand term..."
(p. 10490, right column, second paragraph) should be E[d(sa0,s0)]
= E[d(s0x,
s0y)].
We are grateful to Anders Kvist of Lund University for bringing this error to our attention.
jl 15Feb07