Fig. 14 The ion map for m/z 885, m/z 215 and m/z 744 and m/z 734 obtained from the slices of the spinal cord for NEDC matrix with the different number of layers (A) and four different heights of spraying nozzle (B) for the negative ionization mode (matrix: 7 mg/ml NEDC, 70% MeOH), (m/z 215 – [glucose +Cl-]). Additionally, a picture of the glass covered with NEDC matrix.