Bradyrhizobium japonicum senses iron through the status of haem to regulate iron homeostasis and metabolism.

Mol Microbiol · 2006 · PMC1424673 · PMID 16573691

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likely to be significantno p-value reported

This decrease is likely to be significant because the parent strain is already iron-limited.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.