Proton beam irradiation inhibits the migration of melanoma cells.

PLoS One · 2017 · PMC5634624 · PMID 29016654

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The sentences

may be significantno p-value reported

These sublethal doses may be significant in fractionated therapy or in combination therapies involving radiation treatment.

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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.