21107
However , Rac1 activation was not affected by Jak2 or Stat3 RNA interference , suggesting that the effect of cucurbitacin I occurs through a Jak2 - independent mechanism .
 cucurbitacin I
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cucurbitacin I