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Enlarged view of EP4 receptor mRNA in situ hybridization (blue dots) in hyperplastic renin cells of AS−/− mice. Arrowheads highlight selected EP4 receptor mRNA expression signals. Thick dotted line indicates a glomerulus. Thin dotted line indicates hyperplastic renin cells. aa, afferent arteriole; red dots, PDGFR-β mRNA expression. Bar indicates 50 μm
