In “Surface Immunoglobulin on Frog Lymphocytes: Identification of Two Lymphocyte Populations” by M. Jules Mattes and Lisa A. Steiner in the September issue of the Journal of Immunology, Volume 121, Number 3, the fluorescence in Figure 2 (page 1120) and Figure 3 (page 1121) was not shown clearly. These figures are reprinted below on a better grade of paper.

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