Figure 3.

Endosymbionts 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.

Kneip et al. BMC Evolutionary Biology 2007 7:55   doi:10.1186/1471-2148-7-55
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