Gradual genetic and morphologic transitions occur between intermediately derived forms around the ring, whereas abrupt changes occur between the most divergent forms at the terminus, with rare hybridization restricted to few generations of hybrids or even full RI [ 21, 22].
Among them, we considered only the most divergent forms, indicated by a neighbor-joining tree, avoiding the selection of closely related isoforms.
One of the two divergent forms of leucyl-tRNA synthetase in haloarchaea was acquired from an organism related to the ancestor of the bacterial domain by an ancient transfer (Andam et al. 2012).
An unexpected finding from the transcriptomic analysis of developing bitter melon seeds was the discovery of two divergent forms of FAD2, the Δ12 oleic acid desaturase.
In heterothallic (obligate outbreeding) species, these MAT genes are contained within a region of the genome termed the MAT locus, with highly divergent forms of this locus, known as "idiomorphs," present in isolates of sexually compatible MAT1-1 and MAT1-2 genotypes.
Further, the importance of having two divergent forms of GroEL for protein folding is suggested from observations on GroEL sequences in Synechocystis sp. PCC 6803, where it has been observed that GroEL1 and GroEL2 respond differently to heat shock and light conditions [ 20, 21].
Phyletic patterns suggest that their explosive diversification in eukaryotes, giving rise to highly divergent forms such as the Scd6p family, appears to have happened prior to the divergence of the extant eukaryotic lineages.
Members of the Solanaceae have evolved into extremely divergent forms, ranging from trees to annual herbs, and they occupy diverse habitats ranging from deserts to aquatic areas [ 1].
The similarity of plasticity mechanisms across divergent forms of CNS injury suggests that plasticity, as with development, uses a limited repertoire of events across numerous contexts.
Even though environmental divergent sequences showed no match to known viral sequences, the possibility that some of these environmental divergent forms are carried by viruses rather than hosted in cells remains of course open.
