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1. Water and saline intake was measured in rats depleted of Na by I.P. dialysis. Na intake was prevented 180 min but not 60-90 min after bilateral nephrectomy. Unilateral nephrectomy as well as ureteral ligature had no effect on Na intake. 2. Renin (3u.) injected I.P. re-established the Na appetite abolished by nephrectomy. 3. Angiotensin I (5 ng) or II (5-40 ng) injected into the 3rd ventricle, also restored the Na intake and this effect was dose-dependent. 4. The angiotensin converting-enzyme inhibitor Sq 20,881 (1 mg/kg) inhibited the effect of AI but not that of AII in restoring Na intake. 5. It is concluded that the kidneys might play a role in the regulation of Na intake through the renin-angiotensin system.

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