As in other organs, these progenitors can reside as transit-amplifying pools, by which lineage-biased progenitors expand to replenish discrete mature phenotypes.
Epithelial mesenchymal transition is a complex process by which epithelial cells transit to mesenchymal phenotype through loss of epithelial cell cell junction and actin cytoskeleton reorganisation (De Craene and Berx, 2013).
EMT and MET comprise the processes by which cells transit between epithelial and mesenchymal states, and they play integral roles in both normal development and cancer metastasis.
Thus, transit peptides may evolve by exon shuffling from pre-existing plastid-targeted genes [ 6, 16, 21] and/or by the help of the here demonstrated self-targeting mechanism, by which the transit peptides are moulded from the N-terminal part of the mature protein by subsequent mutation.
In contrast to the ease by which the transit of fluorescence-tagged proteins is followed, the study of the pathways by which small molecules move from one sub-cellular compartment to another has been complicated by the difficulties associated with tracking these movements.
However, evidence points toward PD being the channel by which small RNAs transit between cells (Fig 1) (Vatén et al, 2011): A dominant mutation in the CALS3 gene that directs callose synthesis causes the accumulation of callose in PD and inhibits the intercellular transit of proteins and small RNAs through PD (Vatén et al, 2011).
Here we review the roles of some of the factors contributing to the pathway by which Pol II transits chromatin with emphasis on recent developments from studies in Saccharomyces cerevisiae which has proven to be an excellent model system.
The precise mechanism by which the proteins, following transit through the secretion needle, are inserted in the inclusion membrane is unknown.
The molecular mechanisms by which tRNA molecules enter and transit the ribosome during mRNA translation remains elusive.
Where territorial waters comprise straits used for international navigation (e.g., the straits of Gibraltar, Mandeb, Hormuz, and Malacca), the navigational rights of foreign shipping are strengthened by the replacement of the regime of innocent passage by one of transit passage, which places fewer restrictions on foreign ships.
