What is the name of the chemicals that regulate the cell cycle?

Cyclins are the chemicals that regulate the cell cycle. They are part of the family of proteins. There are various types of cyclins, cyclin A, cyclin D, cylcin T, cyclin E and more.

A cell cycle's progress is generally hampered by two key issues, alternation and completion. Cyclin-dependent kinases or CDKs, which are enzymes, help in the solution of these issues. Cyclins attach themselves to CDKs and make them operative.

A cell's cycle is comprised of four phases, G1 and G2, which are gap phases, M phase and S phase. An example of cyclins' role is during the transition from G1 to S. Here cyclins E and D work on CDKs 4 and 2.