S期
The term "S期" refers to the "S phase" of the cell cycle, which is a crucial stage in cellular division. During this phase, DNA replication occurs, allowing the cell to duplicate its genetic material. This ensures that when the cell divides, each new cell will have an identical set of chromosomes.
The S phase is part of the larger cell cycle, which includes other phases such as G1 phase, G2 phase, and M phase. Proper regulation of the S phase is essential for maintaining genetic stability and preventing issues like cancer, where uncontrolled cell division can occur.