Raw data from the experiments. All data obtained with use of Orbitrap Velos mass spectrometer (Thermo Scientific). Directories contain data from LC-MS analyses of peptides obtained by digestion with different proteases: - Arg-C - Pepsin - Thermolysin - Trypsin Each directory contains 11 files obtained during analyses of different HPLC fraction. The number in the filename is the number of fraction.