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Causes of deficiency may be:
 
Causes of deficiency may be:
:'''Central''': failure to synthesise or release or ADH
+
:'''Central''': failure to synthesise or release of ADH
 
:'''Nephrogenic''': failure of the [[:Category:Nephron|nephrons]] to respond to ADH present in the kidney
 
:'''Nephrogenic''': failure of the [[:Category:Nephron|nephrons]] to respond to ADH present in the kidney