23102
The significant elevation of antioxidative enzymes in parallel with increased formation of hydrogen peroxide appeared from 0 . 5 mu g / L of anatoxin - a .
 Chemical: hydrogen peroxide; Chemical: anatoxin - 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: hydrogen peroxide; Chemical: anatoxin - a