Description:4DNESUSNJ46D: SMSN (Barentine et al 2019 bioRxiv) - Microtubules and ER in COS-7 Validation experiment of fast 3D, two-color single-molecule switching nanoscopy on relatively thin targets with well-known tubular structures. This sample includes microtubules, a standard test target for single-molecule switching nanoscopy techniques.