Longer first introns are a general property of eukaryotic gene structure.

PLoS One · 2008 · PMC2518113 · PMID 18769727

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a significant trendno p-value reported

This study analyzes all available data on intron lengths in GenBank and finds a significant trend of increased length in first introns throughout a wide range of species.

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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.