The 5' UTR of VEGF mRNA contains two IRES elements which are able to promote efficient translation at the AUG start codon, this family represents IRES A.
The 5' untranslated region (UTR) of VEGF messenger RNA (mRNA) features two internal ribosome entry sites (IRES) that enable swift translation initiation at the start codon AUG, categorizing them as members of the IRES A clan.