About 30 percent of North Korean defectors from areas near the Punggye-ri nuclear site have been found to show chromosomal mutations potentially li...

About 30 percent of North Korean defectors from areas near the Punggye-ri nuclear site have been found to show chromosomal mutations potentially li...

South Korea found elevated chromosome markers in 44% of 59 defectors tested last year but could not link the findings to North Korea's nuclear tests.