Nextdoor is the private social network for your neighborhood. On Nextdoor, neighbors create private groups for their neighborhoods where they can ask questions, get to know one another, and exchange local advice and recommendations.
Up-regulation is a process that occurs within a cell triggered by a signal (originating internal or external to the cell), which results in increased expression of one or more genes and as a result the protein(s) encoded by those genes.
Checkpoint controls in eukaryotic cells. Checkpoints serve to monitor the order of events in the cell cycle and ensure that a cell cycle event occurs only after the completion of a prior event (Weinert and Hartwell, 1989).