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Summary: sion was not so much between the
species (as would be expected if expres-
sion follows overall genetic divergence),
but rather between the northern popu-
lation and the two southern popula-
tions. These are then good candidate
genes for investigation of a role in
physiological adaptation to the marine
thermal gradient.
All of these results are to a broad
approximation in agreement with those
from several other organisms. Two
recent comparisons of haploid yeast
strains (Cavalieri et al, 2000; Brem et al,
2002) suggest that up to 25% of the
transcriptome differs among isolates, as
did a study of Drosophila melanogaster
adults (Jin et al, 2001). None of these
studies compared individuals, but they
both showed that there is a genetic
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