2591
Although TK activity was consistently observed by immunoblotting extracts from activated RAW 264.7 cells , LPS-induced phosphotyrosine residues were not observed from similarly treated CHO/CD14 cells .
 CHO/CD14 cells, RAW 264.7 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:
 CHO/CD14 cells, RAW 264.7 cells