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How can I limit my search to a "subset" of ...

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How can I limit my search to a "subset" of database sequences?

You can use the "Limit by Entrez Search" option found on most Standard BLASTR search pages to run an Entrez search and have your query sequence compared to the resutls of this search. For example, if you wanted to limit you search to all phosphorylase sequences from mouse you could enter the following valid Entrez search strategy in the Limit by Entrez field of the BLAST search page: phosphorylase AND "Mus musculus"[Organism]

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