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(a) Representative images of positive staining of atrial natriuretic peptide (ANP) in renal cortex. (b) Representative images of positive staining of ANP in renal medulla. Original magnification 400x. NS: normal salt diet group, HS: high salt diet group, NS-T: normal salt diet plus tempol group, HS-T: high salt diet plus tempol group. G: glomerulus, CCD: cortical collecting duct, MCD: medullary collecting duct.
