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The Epstein-Barr virus latent membrane protein-1 ( LMP-1 ) is an integral membrane protein which transforms fibroblasts and is essential for EBV-mediated B-cell immortalization .
 latent membrane protein-1, integral membrane protein, LMP-1, fibroblasts
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:
 latent membrane protein-1, integral membrane protein, LMP-1, fibroblasts