Fig. S3.

Molecular network to highlight unique chemicals from hand and phone of each person. Molecular network was generated from LC-MS/MS data collected from hands and phones of 39 individuals, using a cosine threshold of 0.65. Networking parameters included the following: precursor m/z tolerance of 1 Da, fragment mass tolerance of 0.5 Da, minimum matched fragments ions 4 (see details in Materials and Methods, Molecular Networking). The network was exported and displayed in Cytoscape and resulted in a total of 10,383 nodes, representing consensus of at least three MS/MS spectra. A color and size (bigger size) coding was used in Cytoscape to highlight the unique nodes that match between a hand and a phone of a same person. Every color is specific to each person represented in this network. Note that only matched MS/MS spectra between hands and phones were represented in this figure; nodes that are specific to hands or phones only were also present, as well as shared nodes between several persons. The molecular network is accessible here: gnps.ucsd.edu/ProteoSAFe/status.jsp?task=eea01f9ec9ea44bc80d76de30da67be4, ftp://massive.ucsd.edu/MSV000078993). A–G represent subnetworks that were enlarged and highlighted in Fig. 4.