Underground Radiobiology: A Perspective at Gran Sasso National Laboratory.

Front Public Health · 2020 · PMC7750398 · PMID 33365298

Europe PMC DOI

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may be significantno p-value reported

Experimental evidence indicates that despite natural radiation background is presently extremely small nevertheless it may be significant enough for living organisms to sense it and respond to it, keeping memory of this continuous exposure.

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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.