1350
The recent discovery of mutations in the common gamma chain (gamma c) gene , a constituent of several cytokine receptors , in XSCID provided an opportunity to test directly whether a previously unrecognized mutation in this same gene was responsible for XCID .
 ( DNA: common gamma chain (gamma c) gene, None) , ( protein: cytokine receptors, 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: common gamma chain (gamma c) gene, None) , ( protein: cytokine receptors, None) 