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We found that GIG18 was rapidly induced to comparable levels by both AR and GR , demonstrating that AR can indeed function as a transcriptional activator in S49 cells and, moreover, that GIG18 induction may be a marker of early apoptotic events in steroid-treated cells.
 GIG18, AR, GR, GIG18, AR, S49 cells
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:
 GIG18, AR, GR, GIG18, AR, S49 cells