AKT1 and Huntington disease: Similarly as in the putamen, RTP801, SV2A, PSD-95, P-Ser473-Akt, and P-Ser235/236-S6 were highly enriched in the synaptosomal compartment (Supplementary Fig. S2, Enrichment and Supplementary Fig. S3), although no differences in RTP801 levels were observed neither in homogenates (Supplementary Fig. S2, Homogenates) nor in synaptosomes (Supplementary Fig. S3) between HD and non-affected individuals.