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Maintenance of GLP-1R protein expression by GLP-1 stimulation. (A) Western blot analysis of retinal GLP-1R expression in three groups. (B) Immunohistochemistry of retinal GLP-1R in three groups. Data are expressed as the means ± SEM. Statistical analyses were performed by one-way ANOVA followed by Tukey's test. **P<0.01 versus the normal group, ## P<0.01 versus the DR group. The scale bar represents 50μm.
