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The reason could be a different mode of adaptive maturation of neophobia in ravens than in our canids.
This may indicate a crossover to a new mode of adaptive evolution: selective sweeps are driven cooperatively by multiple beneficial mutations, but the adaptive dynamics remain intermittent.
This particular mode of adaptive evolution has likely occurred repeatedly in the CC-type class of GRXs, where initially redundant duplicates (in expression pattern and peptide properties) undergo a period of subfunctionalization caused by genetic drift.
Such mode of adaptive molecular evolution, which was hardly recognizable by existing analytical methods aiming to detect strong selection on individual amino acid changes, may play a substantial role in the evolution of novel proteins.
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Two modes of adaptive local search schemes are developed in this paper.
The programming of binding sites and of cooperative interactions between them is found to provide efficient modes of adaptive evolution whose tempo can be quantified for the case of point mutations.
We note that other modes of adaptive evolution are plausible, such as a burst of adaptive evolution in an accessory gene following an LGT event or long term divergent selection pressure between pathogenic and non-pathogenic lineages of streptococci, but they are not detectible by using the codon models employed in this study.
It has also been suggested that the driving force underlying the geographical mode of speciation (adaptive evolution, vicariance) can be inferred from phylogeny (Avise and Walker 1998; Losos and Glor 2003).
Our results have important implications for theories about the mode and tempo of adaptive radiations.
Both IL-1 and IL-18, produced during the first phase of inflammation mediated through the two-signal model of TLRs and NLRs, can induce the cellular and humoral modes of the adaptive immune response.
Ecological adaptation through host shifts and substratum specialization is likely to be an important mode of speciation and adaptive radiation in polypores (Skaven Seierstad et al. 2013).
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