13226
The activation status of the chromosomes involved in the translocation was determined by simultaneous immunocytogenetic studies using antibodies against either BrdU incorporated at late S phase or acetylated histone H4 .
 ( protein: antibodies, None) , ( protein: BrdU, None) , ( DNA: chromosomes, None) , ( protein: acetylated histone H4, 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: antibodies, None) , ( protein: BrdU, None) , ( DNA: chromosomes, None) , ( protein: acetylated histone H4, None) 