In the news feature “The tiny toolkit” (Nature 423, 10–12; 2003), an image of a cantilever on page 11 was incorrectly credited to the California Institute of Technology. It was actually developed by teams at IBM Zurich Research Laboratory and the University of Basel. On page 12, the diagram labels have been mixed up — the left-hand protein should be marked 'field off' and the right-hand protein 'field on'.