NCBI Peptidome is a public repository that stores and freely distributes tandem mass spectrometry peptide and protein identification data. NCBI has discontinued the Peptidome repository but all the existing data and metadata files are indefinitely available at the FTP server ftp://ftp.ncbi.nih.gov/pub/peptidome/.
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Website states that the repository is discontinued and is in an offline mode; all the data files can be obtained from its FTP site (as on 14 Nov 2016)
Please use the following to cite: "Varsha Ravikumar and Vinod Kumar H.S (Correspondence: Acharya KK, kshitish@ibab.ac.in), A list of resources for Mass spectrometry; In: Startbioinfo; 22 Apr 2013, /cgi-bin/prelimresources.pl?tn=Mass spectrometry"