Expression of CTSD mRNA in proximal tubular cell clusters of LDs and patients with DKD. A: Dot plots showing the expression of CTSD mRNA in proximal tubular cell clusters from living donor (blue) and DKD (pink) kidney. Color intensity indicates expression level, and the size of the dot indicates the percentage of cells expressing CTSD. B: Average expression levels of CTSD from proximal tubular cell clusters of LDs and patients with DKD. The P values shown in the figure are derived from the nonparametric Wilcoxon rank sum tests in the Seurat package. DTL, descending thin limb; LD, living donor; PT, proximal tubule.