12217
Thus , MKK7 is an essential and specific regulator of stress - induced SAPK / JNK activation in mast cells and MKK7 negatively regulates growth factor and antigen receptor - driven proliferation in hematopoietic cells .
 MKK7, SAPK, JNK, MKK7
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 MKK7, SAPK, JNK, MKK7