0 a barrier where cars, passports etc are inspected, or a point that contestants in a race must pass. -- trạm kiểm soát
The second checkpoint is 'positive selection', which occurs after selection has signalled the cell to rearrange the chain genes.
However, news reports indicate that police forces were more interested in mounting illegal checkpoints and extorting bribes from civilians than in maintaining law and order.
The metaphase checkpoint will produce a reversible metaphase arrest in many different cell types.
These results imply the existence of checkpoint regulators which recognise early metaphase molecules and as a result delay meiotic progression.
It is not known, however, whether the same checkpoint exists in porcine zygotes.
This checkpoint therefore provides time for mechanisms of restitution to function and prevent mitotic catastrophe.
If the understanding of checkpoint regulation during early embryonic mitotic cell cycles is limited, similar information is totally lacking concerning meiosis.
In this study, we addressed the developmental activation of the metaphase checkpoint in the zebrafish embryo.
