The cDNAs which become enriched could either directly accelerate the cell cycle or possibly bypass checkpoints or other events which delay rapid growth.
Given the border's porous nature and plentiful opportunities for bypassing checkpoints, some analysts question the enforceability of a buffer zone.
Mutation of PCH2, or SIR2, bypasses checkpoint-induced pachytene arrest, and PCH2 and SIR2 are both needed to prevent meiotic interhomolog recombination within the repeated ribosomal RNA genes that are present in the nucleolus [ 1, 2].
They say the accident happened as the vehicle tried to bypass a checkpoint near Artemivsk, the government-held town in the Donetsk region.
"Initial reports say the driver took the decision to bypass the checkpoint and move on a dirt road," said Vyacheslav Abroskin, the regional head of Ukraine's interior ministry.
However, the remainder of the cells bypass the checkpoint and go into mitosis with damaged DNA, resulting in cells with misaligned and fragmented chromosomes and multipolar spindles.
The concomitant loss of function of p53 affords cells the ability to bypass this checkpoint block and to continue unscheduled proliferation in the face of severe chromosomal instability.
In addition, the presence of a specific pattern of gene expression involving pathways of DNA repair and damage bypass, mitotic checkpoint and apoptosis was demonstrated, suggesting that cells from these carriers may display a much less efficient DNA repair system [ 31].
The recent attacks have raised concerns about Taliban infiltration of Afghan national security forces, but they have also underscored the ease with which militants, posing as soldiers or police officers, can blend in and bypass security checkpoints.
He was briefly detained as a suspected spy in Egypt after bypassing a checkpoint and taking photos of the Suez Canal, and he was detained again in Indonesia after an argument with a bus driver.
