For GSDIM (Ground State Depletion with Individual Molecule return) microscopy using the Leica SR GSD microscope, Active Motif’s fluorescent Chromeo™ 505 dye and conjugated secondary antibodies have been tested by Leica Microsystems. The fluorescent properties of Chromeo 505 dye and secondaries meet the specifications required to perform GSDIM microscopy with the SR GSD system, using the 488 nm/300 mW laser for excitation. To ensure that you achieve the best image quality possible, Chromeo 505-stained slides should be embedded in MEA (β-Mercaptoethylamine) or Mowiol-based embedding media.