Compositional modeling of biological systems in cospanspan(graph)

In this paper we investigate the expressiveness of the compositional formalism of CospanSpan(Graph) in order to model biological systems: first, we provide a compositional and timed description of the combined, complex system of the Heart and a Dual Chamber Pacemaker. Then, we consider as a case study the well-known gene regulation system in the Lac Operon in Escherichia coli.