Fig. 6 Cytology of crown nodules of Chippewa and Hardin soybeans 38 and 45 DAE at 200x magnification. Transverse sections of nodules from (A) Hardin and (B) Chippewa 38 d after emergence (DAE). Longitudinal sections of nodules from (C) Hardin and (D) Chippewa 45 DAE. Sections stained with toluidine blue. Outer cortex (OC), nodule endodermis (NE), inner cortex (IC), infected cells (INC), uninfected cells (UIC) and vascular bundles (VB)

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