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To examine the factors controlling vascular-specific expression of PECAM-1 , we cloned the 5'-flanking region of the PECAM-1 gene and analyzed its transcriptional activity .
 PECAM-1 gene, PECAM-1, PECAM-1, 5'-flanking region
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:
 PECAM-1 gene, PECAM-1, PECAM-1, 5'-flanking region