The epicardium signals the way towards heart regeneration.

Stem Cell Res · 2014 · PMC4241487 · PMID 24933704

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may be significantno p-value reported

The extent and source of RA signalling in these different animal models may be significant, given the endocardial supplement observed in the lower vertebrate injury response.

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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.