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However, these plasmids produced transcriptional activity in HeLa cells only in conjunction with interferon gamma stimulation , a condition in which expression of both CIITA and class II major histocompatibility complex surface proteins are induced.
 surface proteins, HeLa cells, interferon gamma, class II major histocompatibility complex surface proteins, plasmids, CIITA
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:
 surface proteins, HeLa cells, interferon gamma, class II major histocompatibility complex surface proteins, plasmids, CIITA