Figure 1. Matrix-assisted laser desorption ionization time-of-flight mass spectra from optic nerve tissue. A: Positive ion mode matrix-assisted laser desorption ionization–time-of-flight (MALDI-TOF) mass spectrum from mouse optic nerve tissue showing numerous peaks in the m/z 700–875 region. B: Negative ion mode MALDI-TOF mass spectrum from mouse optic nerve tissue showing numerous peaks in the m/z 760–940 region.