4291
These data suggest that a combination of [ + ] and [ - ] - Hup A offers better protection than [ + ] - Hup A and serves as a potent medical countermeasure against lethal dose nerve agent toxicity in guinea pigs .
 Chemical: [ + ] and [ - ] - Hup A; Chemical: [ + ] - Hup A
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: [ + ] and [ - ] - Hup A; Chemical: [ + ] - Hup A