We stained coronal free-floating sections with primary antibodies against pser129 (pser129, rabbit, 1:5000; Abcam, Ab51253) and NeuN (mouse, 1:1000, Millipore, Mab377), and secondary antibodies AlexaFluor 488 anti-mouse (goat, 1:500, Jackson Immunoresearch Laboratories, 115-545-146) and AlexaFluor 594 goat anti-rabbit (goat, 1:500, Jackson Immunoresearch Laboratories, 111-585-144). The staining with thioflavin S was performed in accordance with our previous work [59 (link)].
Stained slides were blind coded before analysis and were imaged with an inverted confocal laser microscope Nikon Eclipse Ti-E. Thioflavin S staining was imaged by averaging 4x scans for each z step of the stack to remove noise using NIS Elements AR 4.00.08 software (Nikon). For all other fluorescence staining, we acquired images by single scan per stack-step. We post-treated the confocal stacks with a kernel-3 median filter to remove noise and generated all final images using NIS Elements AR 4.00.08 software (Nikon).