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Platelet/endothelial cell adhesion molecule-1 ( PECAM-1 ) is a 130-kD member of the Ig gene superfamily that is expressed on platelets , endothelial cells , and certain leukocyte subsets .
 leukocyte subsets, endothelial cells, 130-kD member, Ig gene superfamily, Platelet/endothelial cell adhesion molecule-1, PECAM-1, platelets
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:
 leukocyte subsets, endothelial cells, 130-kD member, Ig gene superfamily, Platelet/endothelial cell adhesion molecule-1, PECAM-1, platelets