1330
Alagille syndrome ( AGS ) is a well-defined genetic entity assigned to the short arm of Chromosome (Chr) 20 by a series of observations of AGS patients associated with microdeletions in this region.
 ( DNA: Chromosome (Chr) 20, None) , ( DNA: short arm, 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: Chromosome (Chr) 20, None) , ( DNA: short arm, None) 