Figure 3From: Nitrogen fixation in eukaryotes – New models for symbiosisEndosymbionts adapted for molecular nitrogen fixation a) A Bradyrhizobium sp. bacteroid in a root-nodule of Glycine max (soybean). b) A Spheroid body of the diatom Rhopalodia gibba. SM: Symbiontophoric membrane SBM: Spheroid body membrane.Back to article page