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PD-L1 expression on kidneys of nephritic (>20 weeks) and prenephritic (4 weeks) MRL/lpr mice was assessed by immunofluorescence microscopy: CD4+ (green), CD8+ (white), and PD-L1 (red) expression. Merged and single-color images are shown for each stain. Scale bars: 50 μm (insets).
