6028
These cells produce a low level of IL - 5 when stimulated with PMA alone ; however , N6 , O2 - dibutyryl cAMP ( Bt2cAMP ) , in combination with PMA , augmented by more than tenfold the IL - 5 production at the mRNA and the protein levels .
 IL - 5, IL - 5
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 IL - 5, IL - 5