12529
Hox11 is a homeobox gene essential for spleen formation in mice , since atrophy of the anlage of a developing spleen occurs in early embryonic development in Hox11 null mice .
 ( DNA: Hox11, None) , ( DNA: homeobox gene, 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:
 ( DNA: Hox11, None) , ( DNA: homeobox gene, None) 