13 October 2006
Vol 314, Issue 5797

About The Cover

Cover image expansion

COVER Fluorescent DNA fragments migrating through an acrylamide gel during electrophoresis. The photograph shows 65 capillaries (left to right) each containing a different sequencing reaction. Nearly 4 million such reactions were used to identify mutations in breast and colorectal cancers. See page 268. Image: D. Dressman