Some websites mention amino acid mutations as ORF1ab, most however use ORF1a/b instead.
So how can I translate from one to the other? What do I need to subtract from say ORF1ab:4588I
to get the corresponding N
in ORF1b:<N>I
?
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corresponds to ORF1b:187I
so one needs to subtract 4401
to go from 1ab
to 1b
and add 4401
to go the other way.
There is now an Open Source online tool that does the conversion, Codon2Nucleotide by Theo Sanderson.