Sequencing errors and orthology determination pose challenges to the use of ESTs as a source of characters for systematics.
Sequencing errors and orthology determination are the major problems when using ESTs as a source of characters for systematics.
Progress with resolving avian phylogeny and thus identification of morphological/behavioral convergence has been enhanced by the use of molecular data that provides a source of characters independent of morphology.
Policing is a symbol, not a source, of the character of a civilisation.
The Islamic State could be a source of villainous characters, but it's fraught with difficulty because it's made up of so many different nationalities drawn from the Middle East, North America, Britain and beyond.
In that study we demonstrated the pertinence of using ESTs as a source of phylogenetic characters, provided there is adequate orthology determination.
Extreme cases of terminological disparity are found in anatomical systems that are under strong selection and/or have high value as a source of diagnostic characters for species.
Of these, vegetative branching is much more variable, responding quickly to changes in environmental conditions, while inflorescence branching is less variable, and is often used as a source of taxonomic characters for separating both species and genera (Clayton and Renvoize, 1986).
Mitochondrial sequence data were extracted and analyzed, as a source of potentially conserved characters, which have proven useful in determining subfamilial relationships in combination with plastome sequences [ 18– 20].
