Schematic representation of different model types Unstructured Structured Reactions rates are Reaction rates are described by functions also of Characteristics input/output rates(q) parameters of intra- that depend on the cellular compartments environment (a,b) Non- 9○P9p a segregated All cells are similar Segregated The population 91○P9p1 contains cells with different 92+○9p2 propertiesSchematic representation of different model types