OGA and tauopathy: Very recently Lu et al. presented the development of effective radiotracers for PET imaging of the enzyme O-GlcNAcase (OGA), a potential biomarker and therapeutic target for tauopathy (Lu S, Haskali MB, Ruley KM, Dreyfus NJ-F, DuBois SL, Soumen P, et al. Discovery and development of 18F- and 11C-labeled LSN3316612 as positron emission tomography radioligands for quantifying O-linked-β-N-acetyl-glucosamine hydrolase in brain, submitted).