A Twist on Cancer DNA
Crammed inside every human cell are numerous strands of chromosomal DNA that, if laid end-to-end, would span a distance of about two meters. A special enzyme mechanically untangles the DNA, keeping our chromosomes from resembling a string of Christmas tree lights jammed into a box after the holiday. Someday, biochemist James Berger's efforts to understand the same enzyme in cancer cells could lead to new tumor-fighting drugs.