11818
Long - term ( 2 - 24 h ) activation of 5 - HT7 receptors regulates growth factor receptor expression , including the expression of platelet - derived growth factor ( PDGF ) beta receptors .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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