First code of every mRNA is
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Step-by-step explanation:
The start codon is the first codon of a messenger RNA (mRNA) transcript translated by a ribosome. The start codon always codes for methionine in eukaryotes and Archaea and a modified Met (fMet) in bacteria, mitochondria and plastids. The most common start codon is AUG.
The start codon is often preceded by a 5' untranslated region (5' UTR). In prokaryotes this includes the ribosome binding site.
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