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(A) Retinal gene expression of Gdf15 in young (6 weeks old) and old (18 months old) mice (n = 4 per group). (B) Retinal gene expression of Tgfb2 in young and old mice (n = 4 per group). (C) GDF15 protein level in AH in young and old mice (n = 5 per group). Values are mean ± SD.
