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BFTC905 and A549 cells expressed relatively high levels of the phosphorylated and total EGFR proteins ; however , A375 , MCF7 and RKO cells did not markedly express these proteins .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None