13009
The IC50 value was 0 . 43 +/- 0 . 18 mu g / ml after 48 h treatment while the calculated value was 0 . 73 +/- 0 . 10 mu g / ml for the culture media totally refreshed after 2 h treatment with venom .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None