Erratum: The systems biology graphical notation

Terri A Addona, Susan E Abbatiello, Birgit Schilling, Steven J Skates, D R Mani, David M Bunk, Clifford H Spiegelman, Lisa J Zimmerman, Amy-Joan L Ham, Hasmik Keshishian, Steven C Hall, Simon Allen, Ronald K Blackman, Christoph H Borchers, Charles Buck, Helene L Cardasis, Michael P Cusack, Nathan G Dodder, Bradford W Gibson, Jason M Held, Tara Hiltke, Angela Jackson, Eric B Johansen, Christopher R Kinsinger, Jing Li, Mehdi Mesri, Thomas A Neubert, Richard K Niles, Trenton C Pulsipher, David Ransohoff, Henry Rodriguez, Paul A Rudnick, Derek Smith, David L Tabb, Tony J Tegeler, Asokan M Variyath, Lorenzo J Vega-Montoto, Asa Wahlander, Sofia Waldemarson, Mu Wang, Jeffrey R Whiteaker, Lei Zhao, N Leigh Anderson, Susan J Fisher, Daniel C Liebler, Amanda G Paulovich, Fred E Regnier, Paul Tempst & Steven A Carr Nat. Biotechnol. 27, 633–641 (2009); published online 28 June 2009; corrected after print 9 September 2009