516
In addition , vascular strips and human umbilical vein endothelial cells ( HUVECs ) were used in organ bath , Western blot , nitrite , and cyclic guanosine monophosphate ( cGMP ) measurements .
 Chemical: nitrite; Chemical: cyclic guanosine monophosphate; Chemical: cGMP
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nitrite; Chemical: cyclic guanosine monophosphate; Chemical: cGMP