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The present study investigated PPARalpha expression in human ECs and their regulation of vascular cell adhesion molecule-1 ( VCAM-1 ).
 VCAM-1, ECs, human ECs, vascular cell adhesion molecule-1, PPARalpha
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:
 VCAM-1, ECs, human ECs, vascular cell adhesion molecule-1, PPARalpha