This example is a Modelica version of the model publised by J. T. Tyson (1991).
model for further documentation and simulation results.
John J. Tyson, "Modeling the Cell Division Cycle: cdc2 and Cyclin Interactions," Proceedings of the National Academy of Sciences of the United States of America
, 88(16), 1991, pp. 7328-7332 www.pnas.org/content/88/16/7328.full.pdf