perinatal. relating to the period shortly before and after birth; the actual time varies between species. The last 10 to 15% of the pregnancy before parturition to the end of a comparable period after birth would cover present usage of the term. perinatal mortality. the percentage of animals in the danger period which die, as a ratio of the total number exposed.
Normal Gene Tumor Suppressor Gene Is nicknamed the Guardian of the Genome.. Can arrest the cell cycle, trigger apoptosis or senescence, and repair DNA. Chromosome 17 Cell Survival Produces a protein called tumor protein p53, which regulates cell division.
What sort of information do they encode, and how can this affect a cell's characteristics and activities? Some genes enable cells to make proteins needed for basic functions; dubbed housekeeping genes, they are active in many types of cells. Other genes, however, are inactive most of the time. Some genes play a role in early development of the embryo and are then shut down forever. Many genes encode proteins that are unique to a particular kind of cell and that give the cell its character - making a brain cell, say, different from a bone cell. A normal cell activates just the genes it needs at the moment and actively suppresses the rest.