5193
These data also indicate a higher sensitivity of Psi ( 0 ) ( average Psi ( 0 ) - EC ( 50 ) of 91 +/- 11 nM or 19 . 6 +/- 0 . 9 mu gL ( - 1 ) ) compared to Phi ' ( M ) ( average Phi ' ( M ) - EC ( 50 ) of 217 +/- 19 nM or 46 . 8 +/- 4 . 1 mu gL ( - 1 ) ) and suggest that photoregulation processes activated in presence of light decrease the effect of atrazine .
 Chemical: atrazine
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: atrazine