Corrections and Clarifications
In figure 3A (p. 1961) of the Research Article "Architectures of class-defining and specific domains of glutamyl-tRNA synthetase" by O. Nureki et al. (31 Mar., p. 1958), the labels for the ribbon diagrams showing the folding of Thermus thermophilus glutamyl-tRNA synthetase (GluRS) and glutaminyl-tRNA synthetase (GlnRS) were inadvertently interchanged. The diagram for GluRS appeared at the top, and that for GlnRS appeared at the bottom.