When ribosomes encounter upstream open reading frames (uORFs) during scanning of the 5' untranslated region (5' UTR), translation of the downstream ORF requires re-initiation. In a recent paper in Nature, Schleich et al. describe metazoan factors which specifically promote re-initiation.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4260343PMC
http://dx.doi.org/10.1038/cr.2014.114DOI Listing

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