Corrections and Clarifications
Note 29 on page 1175 of the report "Lack of N regions in antigen receptor variable region genes of TdT-deficient lymphocytes" by T. Komori et al. (27 Aug., p. 1171) should have included the information that the murine TdT clone used in that study was obtained from N. R. Landau, as described in a 1987 paper by N. R. Landau, D. G. Schatz, M. Rosa, and D. Baltimore [Mol. Cell. Biol. 7, 3237 (1987)] (reference 13 of the report by Komori et al.).