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Aging-related changes in dopamine receptor protein expression in the striatum. A: representative Western blots of D1 receptor (D1R), D3 receptor (D3R), and β-actin expression. a-D1, D1R antibody; a-D3, D3R antibody; β-actin, β-actin antibody. B: β-actin expression. C: D1R protein expression. D: D3R protein expression. a.u., Arbitrary units. *Significant differences.
