GAPDH and infection: The RT-qPCR data were normalized to the mean value of the transcriptionalactivity of two housekeeping genes (GAPDH andSDHA) since their expression profile was only marginallyaffected (SDHA; log2 = 0.2, P = 0.3; GAPDH;log2 = 0.2, P = 0.04) upon AAV2 infection.