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The Megakaryocyte/Platelet-specific enhancer of the alpha2beta1 integrin gene : two tandem AP1 sites and the mitogen-activated protein kinase signaling cascade .
 Megakaryocyte/Platelet-specific enhancer, AP1 sites, mitogen-activated protein kinase, alpha2beta1 integrin gene
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:
 Megakaryocyte/Platelet-specific enhancer, AP1 sites, mitogen-activated protein kinase, alpha2beta1 integrin gene