Credit Clarified for Biomolecules Work

Our article “The Manipulation of Single Biomolecules” (Physics Today, October 2001, page 46) contained errors in referencing. The reference from which figure 2 on the motion of kinesin was taken is K. Visscher, M. J. Schnitzer, S. M. Block, Nature   400 , 184 (1999  https://doi.org/10.1038/22146 ). The first observations of the stepping of a molecular motor, the 8-nm steps of kinesin, were reported in K. Svoboda, C. F. Schmidt, B. J. Schnapp, S. M. Block, Nature   365 , 721 (1993  https://doi.org/10.1038/365721a0 ). Similarly the analysis of the time between steps from which the number of ATP molecules consumed could be deduced has been published in M. J. Schnitzer, S. M. Block, Nature   388 , 386 (1997  https://doi.org/10.1038/41111 ) (ref. 4 in our article, not ref. 1) and W. Hua, E. C. Young, M. L. Fleming, J. Gelles, Nature   388 , 390 (1997  https://doi.org/10.1038/41118 ).