How does cell cycle regulate mitosis

Cells regulate their division by communicating with each other using chemical signals from special proteins called cyclins.

Starting, Stopping, and Making Protein. In any mRNA molecule, one codon always marks the beginning of a protein. That "start" codon is usually AUG in both eukaryotes and prokaryotes, although eukaryotes use GUG on rare occasions. AUG codes for the amino acid methionine.