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.
When does mitosis occur in human cells? Mitosis occurs when tissues are damaged, for example, if there is a wound, mitosis is a rapid form of cell division that eventually heals to be new skin. Mitosis can occur in â¦the body anywhere, wherever new cells need to be produced to replace old or damaged cells.