1724
The two tiny ring X chromosomes studied with an antibody specific for the acetylated isoforms of histone H4 marking transcribed chromatin domains were labeled at a level consistent with their being active.
 ( protein: antibody, None) , ( protein: histone H4, None) , ( DNA: X chromosomes, None) , ( DNA: transcribed chromatin domains, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: antibody, None) , ( protein: histone H4, None) , ( DNA: X chromosomes, None) , ( DNA: transcribed chromatin domains, None) 