21102
Cucurbitacin I inhibits rac1 activation in breast cancer cells by a reactive oxygen species - mediated mechanism and independently of janus tyrosine kinase 2 and p - rex1 .
 Cucurbitacin I, oxygen, tyrosine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Cucurbitacin I, oxygen, tyrosine