Our results, obtained using different paralog and network definitions, show that, after an initial period when gene duplication was indeed instrumental in expanding the metabolic space, the latter reached an equilibrium and subsequent gene duplications were used as a source of more specialized enzymes rather than as a source of novel reactions.
It's a much more pressing issue for book sites, in fact, than it is for sites like Netflix or any number of shopping sites: the knowledge required is much more specialized and cannot be sourced from the cloud, as movie recommendations can; and the enormous backlist of published literature easily overwhelms the online researcher.
The stone tools found from this era became smaller and more specialized to use these new food sources.
He looked for other sources, in a more specialized area.
However, the symptoms of Werner syndrome suggest defects in patients' mesenchymal stem cells (MSCs), a more specialized stem cell type that is the source of fat, cartilage, and bone cells.
Upper domain ontologies can either be used alone as a source of basic categories (e.g. for the coarse annotation of resources) or as a common reference for more specialized domain ontologies.
The word "community" in reference to anything beyond an immediate physical or social environment seemed too touchy-feely, and was the source of many jokes among my friends about ever more specialized in-groups.
Harmonia Mundi, which has become a major player in recent years despite a generally more specialized repertory, comes in second, with 4. But excellent recordings keep coming out from smaller sources as well, and they dot the list that follows.
In particular, the sources of income have become concentrated to much fewer options than before resettlement, with some households more specialized in fisheries than others.
This organism appears to be more specialized than the other two in that it is restricted to the use of peptides and amino acids as energy sources, although formate can also be utilized.
