blast search against UNIPROT I would like to ask how i can search in blast against UNIPROT (TREMBL PLUS SWISSPROT) for a selected organism. In the BLAST site there is no option about UNIPROT(only Swissprot), and in the uniprot site i cannot limit the results only in one organism(E.COLI). THANKS A LOT!!!

You can blast for E.coli proteins only using Uniprot. Firstly, you restrict the search to the "target database" UniprotKB...Bacteria. After performing the blast search, you can further restrict your search results to include only hits for one "Popular organism", e.g. "Escherichia".