Figure 1: Immunofluorescent staining of angiotensin-converting enzyme (ACE; green), ACE2 (red), and a nuclear marker (DAPI; blue) in kidney specimens (A, B, C). Merged images of ACE and ACE2 (yellow) staining showing the colocalization of ACE and ACE2 in the proximal tubules of a healthy control (A) and an MCNS (C) patient. The merged images for the diabetic nephropathy patient do not include the yellow signals reflecting weak ACE2 staining (B).