The template of hepatitis B virus (HBV) transcription, the covalently closed circular DNA (cccDNA), plays a key role in the life cycle of the virus and permits the persistence of infection.
HBV cccDNA plays a key role in the life cycle of the HBV and permits the persistence of infection.
The reduction in prey defense consequently permits the persistence of the predator, even though environmental conditions are not favorable to the predator, and the predator population itself has not evolved (Fig. 1B).
Organized agriculture and its geographical spread resulted in increase of population densities and human movements that permitted the persistence and spread of "civilization pathogens," such as measles, small pox, malaria, and so forth, which transmit rapidly from one person to another, often resulting in death of the infected person (Fiennes 1978; McNeill 1989; Diamond 1997, 2002).
While the 108N mutation appears to have no role in conferring resistance in Peru, it could permit for the persistence of gametocytes.
The recurrent invasion of closely related uninfected species, via horizontal transfer, is a hypothesis that permits the longer-term persistence of HEGs by maintaining purifying selection.
This mechanism of regulation permits the rapidity and persistence of PGC-1α activation to be independently controlled.
9 Another possibility is HPV genotyping to target the most carcinogenic genotypes and permit the tracking of viral persistence.
Another possibility is HPV genotyping that could target the most carcinogenic of approximately 15 carcinogenic genotypes and could permit the tracking of viral persistence.
On the other hand, marked reduction of AT levels at the onset of septic shock may be a sensitive marker of unfavorable prognosis, presumably by permitting persistence of the procoagulant state.
However, the persistence of cancer stem cells in this scenario prevents tumor eradication and permits the evolution of acquired resistance, which renders the response to treatment short-lived.
