In the article "N- and C-Terminal Domains of β-Catenin, Respectively, Are Required to Initiate and Shape Axon Arbors of Retinal Ganglion Cells In Vivo," by Tamira M. Elul, Nikole E. Kimes, Minoree Kohwi, and Louis F. Reichardt, which appeared on pages 6567-6575 of the July 23, 2003 issue, two references were omitted from the article. In Materials and Methods, in the section entitled DNA plasmid construction, the following reference was omitted for the construct called ΔARM: Giannini AL, Vivanco MM, Kypta RM (2002) Analysis of β-catenin aggregation and localization using GFP fusion proteins: nuclear import of α-catenin by the β-catenin/Tcf complex. Exp Cell Res 255:207-220. In the Discussion, the following sentence and reference were omitted from the last paragraph: "Tyrosine phosphorylation of β-catenin has also been implicated in regulation of synaptic size and function in hippocampal neurons (Murase et al., 2002)." This sentence should be the second to last sentence of that paragraph. The reference applicable to that sentence is as follows: Murase S, Moser E, Schuman EM (2002) Depolarization drives β-catenin into neuronal spines promoting changes in synaptic structure and function. Neuron 35:91-105.