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Determinate and indeterminate nodules formed on the same Sesbania rostrata plant. (Left) Nodules harvested from different parts of the host plant as indicated on the Right. Region I corresponds to the lower part of the stem, region II is the part of the root grown in the dark in the vermiculite compartment of the Leonard jar, and region III is the youngest part of the root, which protrudes in the lower compartment of the Leonard jar.
