20903
In addition , VLPs prepared following methods ( i ) and ( iii ) aggregate only at the isoelectric point ( pH ~ 3 - 4 ) in 1 mM NaNO3 solution .
 Chemical: NaNO3
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: NaNO3