Representative Tom Barrett is running for a second term in his battleground Lansing district, where Donald Trump won by one percentage point in 2024. Election date: Nov. 3 Mr. Barrett faces William ...

Representative Ryan Mackenzie, a Republican, is running for re-election in this battleground district in Pennsylvania’s Lehigh Valley. Election date: Nov. 3 Mr. Mackenzie faces Bob Brooks, a retired ...

Repetitive sequences make extrachromosomal DNA vulnerable to breaks, which could be exploited for therapy — but might also promote tumour evolution.

Cancer cells that carry ecDNA appear to rely on specialized repair machinery to keep these fragile DNA circles intact. Credit ...