1656
Using a modified sperm typing protocol , the mutation frequency of the CAG repeat region at the androgen receptor locus has been measured using a rare semen sample from an individual with spinal and bulbar muscular atrophy ( SBMA ).
 ( cell type: sperm, None) , ( DNA: CAG repeat region, None) , ( DNA: androgen receptor locus, 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:
 ( cell type: sperm, None) , ( DNA: CAG repeat region, None) , ( DNA: androgen receptor locus, None) 