2961
We then showed that static exposure of embryos to paraoxon ( 31 . 2 - 500 nM ) from 5 to 96 hpf resulted in significant stage - and concentration - dependent AChE inhibition , albeit these effects were fully reversible within 48 h following transfer to clean water .
 Chemical: paraoxon
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: paraoxon