BLAST results shows partial matches

Hello fellow researchers!

I got BLAST results that show that only small part of each sequence in an assembly match the BLAST database. The greatest number of such matches is for bacteria. It's expected to have contamination of bacteria, so the question is why, for instance, only half of a sequence in the assembly matches bacteria according to the BLAST results, and not the entire sequence or 80% or 90% of it?

Thanks!


blast


BLAST


assembly

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