A pullout from an illustration of inside the body shows how a toxin implicated in colon cancer binds to DNA. The squiggly representation of the toxin holds both sides of DNA's double helix.

How a bacterial toxin linked to colon cancer messes with DNA

A closeup look at colibactin’s structure reveals chemical motifs that guide its mutation-wreaking “warheads” to specific stretches of DNA.

Science News