Plant Biology. In the article “Sucrose is a signal molecule in assimilate partitioning” by Tzyy-Jen Chiou and Daniel R. Bush, which appeared in number 8, April 14, 1998, of Proc. Natl. Acad. Sci. USA (95, 4784–4788), the following correction should be noted. Due to a typographical error in preparing the manuscript, the units of V_max in Table 2 are incorrect. They should read nmol/mg protein·min.