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Smad5 is thought to relay signals of the bone morphogenetic protein pathway. The 5' untranslated region (5'UTR) of human Smad5 mRNA is long, has the potential to form secondary structures and contains five AUG codons. Here we show that the 5'UTR of Smad5 contains an internal ribosome entry site (IRES) located within 100 nt of the 3' end of the 5'UTR. The(More)
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