Different models of cell cycle regulation converged when scientists realized that different model organisms shared the same molecules. See how data from frogs and yeast were reconciled.

Bodie, Zvi, Robert C. Merton, and William Samuelson. "Labor Supply Flexibility and Portfolio Choice in a Life-Cycle Model." Journal of Economic Dynamics & Control 16, nos. 3-4 (July–October 1992): 427 ...