... this function, is one of the key players of cataboliterepression. Mathematical modelling of signal transduction and gene expres-sion of the enzymes involved in the transport of carbohydrates is ... dynamics of extracellular components); EI, enzyme I (protein,component of the PTS); EIIA, enzyme IIA (protein, component of the PTS, ‘output’ of the system as it activates the synthesis of cAMP);EIIBC ... substrates,the generation of energy in form of ATP, or the syn-thesis of amino acids. Based on this more fuzzy defini-tion, the idea of a modular representation of cellularprocesses is very...