1104
Selected transfected clones produced low levels of IFN A ( IFNA ) constitutively, and their abilities to express interleukin-2 and interleukin-2 receptor upon stimulation with phytohemagglutinin and phorbol myristate acetate were retained.
 interleukin-2, interleukin-2, IFN A, interleukin-2 receptor, IFNA, transfected clones, phytohemagglutinin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 interleukin-2, interleukin-2, IFN A, interleukin-2 receptor, IFNA, transfected clones, phytohemagglutinin