4410
GR expression levels were shown to be rate-limiting for initiating the apoptotic pathway , and a positive correlation between steroid sensitivity and GR -mediated induction of an integrated mouse mammary tumor virus (MMTV) LTR reporter gene was observed.
 GR, GR, mouse mammary tumor virus (MMTV) LTR reporter gene
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, mouse mammary tumor virus (MMTV) LTR reporter gene