2550
Reduction of peak I ( Na ) by GS967 was minimal at a holding potential of - 120 mV but increased at - 80 mV .
 Chemical: Na; Chemical: GS967
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: Na; Chemical: GS967