(B) Diagrammatic representation of a result of GeLC-MS/MS analysis of excised gel regions described in (A). Each coloured block depicts a quantified peptide at its amino acid position according to the horizontal axis. Possible ongoing proteolysis was identified by high abundance ratio of YqgP/YqgP.S288A for a given protein and lower apparent molecular weight than expected for the corresponding full-length protein, as estimated from the position of the respective gel slice relative to the molecular weight marker. 