unBLASTable sequence?

Paraic Kenny paraic at icr.ac.uk
Tue Aug 3 14:16:40 EST 1999

Hi all,

I was trying to BLAST a protein sequence today at the NCBI blast server
and in the results, part of my query sequence came up as a row of
XXXXXXXXs even though it is directly identical to a sequence in the

The "unBLASTable" part of the sequence is


I have also checked it using a different BLAST server with the same

Can anybody explain why the server can't / won't accept this sequence?


Paraic Kenny
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