Mysterious “gene within a gene” found in the coronavirus


Researchers have discovered a mysterious gene in the genetic code of the SARS-CoV-2 coronavirus, a segment virtually hidden from view in the virus genome and largely overlooked until now.

The newly identified gene – called ORF3d – is an example of what is called an overlapping gene: a kind of “gene within a gene” that is actually hidden in a string of nucleotides, due to the way it overlaps the encoded sequences of other genes.

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