Diagrammatic CRN notation To better visualize a CRN \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$C=(\varLambda ,R)$$\end{document}C=(Λ,R) as a circuit, we employ a directed multi-edge graph \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(\varLambda ,E)$$\end{document}(Λ,E) based upon a fragment of the diagrammatic notation for influence graphs Cardelli (2014). \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varLambda$$\end{document}Λ, the nodes, represent the species of the CRN C and edges E are derived from reactions R as follows. A reaction is represented as a directed multi-edge with sets of species as source and target. Each edge is either a pointed arrow (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\uparrow$$\end{document}↑) or a rounded arrow (), with the source represented by the flat edge and the target represented by the arrow head. A reaction that produces a species as a product is connected to it by a directed edge.