How is the cell cycle regulated within the nucleus?
The cell cycle is tightly regulated within the nucleus by a complex network of proteins and signaling pathways. Key regulatory proteins include cyclins, cyclin-dependent kinases (CDKs), and CDK inhibitors. These molecules ensure the proper progression of the cell cycle through its various phases: G1, S, G2, and M. The nucleus also contains checkpoints that monitor DNA integrity and replication, preventing the cell from progressing to the next phase if errors or damage are detected.
