The probable cell of origin of NF1- and PDGF-driven glioblastomas.

PLoS One · 2011 · PMC3170338 · PMID 21931722

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may be significantno p-value reported

However, since many investigations were performed in the developing brain of rodents, there may be significant variation in parameter values when considering the human brain due to both interspecies differences and variability between developing and adult brain tissues.

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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.