Practice question

Among light-based modalities, single-molecule localization techniques achieve finest resolution, surpassing confocal and structured illumination. dSTORM routinely reaches 20-30 nanometers lateral resolution by precisely localizing individual blinking fluorophores across thousands of frames, effectively circumventing Abbe diffraction limit of about 200 nanometers. Phase contrast and DIC remain diffraction-limited and label-free, while confocal improves axial resolution only to about 500 nanometers. dSTORM therefore reveals protein cluster organization, chromatin loops and cytoskeletal periodicity at molecular scale while retaining compatibility with fluorescent tagging of live or fixed cells.