18684
Interactions are dynamic during differentiation , as for example evidenced by the mESC - specific binding of Klf4 to mC and the NPC - specific binding of Uhrf2 to hmC , suggesting specific biological roles for mC and hmC .
 hmC, hmC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 hmC, hmC