Neurobiology. In the article “Calcium-dependent switching of the specificity of phosphoinositide binding to synaptotagmin” by Giampietro Schiavo, Qu-Ming Gu, Glenn D. Prestwich, Thomas H. Söllner, and James E. Rothman, which appeared in number 23, November 12, 1996, of Proc. Natl. Acad. Sci. USA (93, 13327–13332), the following should be noted. In the legend to Fig. 4A, the symbol used for “GST alone” should be (▴) instead of (○), and in the legend to Fig. 4C, the symbol for “antitagmin antibody alone” should be (▴) instead of (○).