Ochre codon

... was at the first exon, it might take over entirely with the first start codon, or its rival start codon might compete for the ribosome thus decreasing ... of the protein synthesis at that first stop codon, unless amber/opal/ochre tRNA's are considered (phew!), or unlikely editing by APOBEC family...(!). ...

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... so you may want to look further on your own. It has to do with the codon triplets, mainly the "stop codons" in particular. Here is ... UAG is amber , UGA is opal (sometimes also called umber), and UAA is ochre . "Amber" was named after its discoverer Harris Bernstein, ...

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