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Analysis of GR chimeric receptors containing the potent VP16 and E1A viral transactivation domains in place of the GR N terminus revealed that even low level expression of these receptors resulted in both enhanced steroid sensitivity and MMTV induction , thus supporting a role for transactivation in apoptosis .
 GR, GR N terminus, GR, GR chimeric receptors
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:
 GR, GR N terminus, GR, GR chimeric receptors