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Abstract. Dopamine (DA), produced in proximal tubular cells, is believed to be an important intrarenal natriuretic hormone. Experimental studies have shown that the natriuretic effect of DA is less pronounced in the fetal kidney. We have evaluated renal DA and norepinephrine (NE) in the neonatal period, using urinary excretion as an indicator of renally produced/released catecholamines. In very low-birth-weight...