Kidney sections (4 μm thick) were stained using standard techniques as previously described (Chodavarapu et al. 2013 (link)). Slides were incubated either with primary polyclonal goat anti-ACE2 (1:150, R&D, MN, USA) or rabbit anti-ADAM17 (1:100, Enzo, USA) overnight at 4°C. Washings were repeated and the sections were incubated with biotinylated donkey anti-goat or anti-rabbit IgG secondary antibody conjugated with Cyanine 3 fluorescent dye. MetaMorph software (Molecular Devices, CA, USA) was used for quantitation.