333
METHODS : The alteration in the NO pathway was assessed by measuring nitrite levels in serum / urine and by evaluating the changes in vascular reactivity of the isolated perfused rat kidney ( IPRK ) system .
 Chemical: NO; Chemical: nitrite
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: NO; Chemical: nitrite