Fig. 7. Transmission electron micrographs of Nod factor-treated lateral root bases. Lateral root bases were harvested 8 days after application of 10^–9 M Nod factors. (A and B) Young developing blue cell. (C) Mature blue cell. (D) Enlargement of nucleus in C. (E) Healthy cell for comparison. (F) Enlargement of nucleus of E. bc, blue cell; hc, healthy cell; n, nucleus; no, nucleolus. (Bars = 1 m m.)