Motus is a tool for searching and inferring reaction motifs in metabolic networks.
A metabolic network is modelled as an undirected graph. Nodes (reactions) are labelled with EC numbers (code of 4 numbers expressing the chemistry of a reaction).
A reaction motif is defined as a set of (partial) EC numbers. An occurrence of the motif in the network is a set of nodes (reactions) which is connected and labelled by EC numbers that are similar to the ones of the motif.
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V. Lacroix, C. G. Fernandes, and M.-F. Sagot.
Motif search in graphs: Application to metabolic networks.
Transactions in Computational Biology and Bioinformatics, vol. 3, pages 360-368, 2006.