As both AAV9-Ctrl and AAV9-FGF6 contain sequences coding for GFP (Figure 2A), we ruled out the spillover of AAV9 infection in other tissues because there was no detection of GFP protein in the iWAT, eWAT, liver (Supplemental Figure 5C), and BAT (Supplemental Figure 5D). Here, CTRL is linked to infection.