Hello,

I'll look into this for you. It should be fairly straight forward, using 
taxonomy as the DB from NCBI.
Alternatively, you can always use BioMart from Taverna. Instead of 
specifying a taxa, you simply connect to the species database of choice 
and get the Ensembl (or whatever) ids you want.

regards,
Paul.


>
> I am new to Taverna. I have easily found several web services 
> available that allow me to get a sequence from an accession number.  
> Most examples I have seen deal with an existing accession number 
> list.  But first, I would like to query genbank with the name of a 
> taxa and get back a list of accession numbers for that taxa preferably 
> in XML so that I can run xpath queries on it.  Then, the next step of 
> my workflow could get the sequences from this list of accession 
> numbers. Are there any services out there that will give me a list of 
> all accession numbers for a particular taxa or a particular gene or both?
>

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