18100
This study was to explore the effect of DNA methyltransferase inhibitor 5 - Aza - 2 ' - deoxycytidine ( Aza - CdR ) on PDGF - induced rat ASM cell phenotypic switching and biological behaviors .
 5 - Aza - 2 ' - deoxycytidine, Aza - CdR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 5 - Aza - 2 ' - deoxycytidine, Aza - CdR