The Mass Spectrometry and Proteomics research group is in charge of the MS laboratory of the institute. The primary objective is to measure mass spectra (MS) for structural elucidation and new compound characterization (molecular composition) in cooperation with the scientific departments of the MPI-CE. In addition to service, which is aimed especially at structure confirmation of synthetic compounds, projects on structure elucidation of natural products and the elucidation of biosynthetic pathways are carried out. New analytical methods are also developed with a focus on new MALDI matrices and small molecule in situ distribution visualization/imaging. Strong attention is put on teaching and training our users, and we have been organizing summer schools with topics in mass spectrometry on small molecules and proteomics.