1541
The hypothesis that modifications of activity and / or expression of nitric oxide synthase ( NOS ) isozymes might play a role in these modifications , via enhanced local production of nitric oxide , was tested in this study .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities:  
Answer:
 None