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We have examined the effect of alpha-tocopherol ( alpha-tcp ) on one cellular event in atherosclerotic plaque development , monocyte adhesion to stimulated endothelial cells ( ECs ).
 stimulated endothelial cells, ECs
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:
 stimulated endothelial cells, ECs