23867
Given the small range in sensitivity observed between populations , commercial laboratory cultures appear to provide a good estimate of the sensitivity of field populations of L . minor to atrazine and should continue to be used in regulatory phytotoxicity testing .
 atrazine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 atrazine