Hi,
I've downloaded the hg18 CDS sequence as follows:
assembly: mar 2006
group: genes and gene prediction track
track: refseq genes
table: refGene
and then
output format: sequence
and then select mRNA on the following page

I notice that many cds sequences do not start with ATG and this does not
seem to
be due to strand.
I also notice that many cds sequences do not end with the three canonical
stop sites (TAG, TGA,TAA)

I am computing codon bias which is extremely sensitive to frame ship so I
want
to be absolutely sure that I have the right codons.

Can you please help me understand how I can go about processing this data so
that
I have the right frame (even though say the exact CDS start or the stop site
is unknown)

--Thanks
Lee
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