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uORFS in the 5′ untranslated region of the RARβ4 transcript. Nucleotides are numbered relative to the transcription start site. Nucleotides 269–625 are removed from exon 5 in the RARβ4 transcript, resulting in a novel exon 5 and exon 6 junction (*). Translation of RARβ4 begins at +448 of the RARβ4 transcript, indicated above right-angled arrow. uORFs in the 5′ (UTR) are indicated above their coding sequence (filled arrowheads = exon junctions).
