b>Summary: We present a Cytoscape plugin for the inference and visualization of networks from high-resolution mass spectrometry metabolomic data. The software also provides access to basic topological analysis. This open source, multi-platform software has been successfully used to interpret metabolomic experiments and will enable others using filtered, high mass accuracy mass spectrometric data sets to build and analyse networks. Availability: http://compbio.dcs.gla.ac.uk/fabien/abinitio/abinitio.html Supplementary material: http://compbio.dcs.gla.ac.uk/fabien/abinitio/doc/Supplementary.pdf Contact: Fabien.Jourdan@toulouse.inra.fr</inter-ref