<p>Error in the sequence in a public database (for example UniProtKB, NCBI RefSeq). Annotation is by the <a rel="external" href="http://vega.sanger.ac.uk/info/about/gene_and_transcript_types.html">VEGA/Havana</a> project.</p>Artifact
Transcript is thought to undergo nonsense mediated decay, a process which detects nonsense mutations and prevents the expression of truncated or erroneous proteins. Nonsense mediated decay
<p>Alternatively spliced transcript that is believed to contain intronic sequence relative to other coding transcripts in a given locus.</p>Retained intron
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