What is positives when I blast two sequences?
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6.2 years ago

When I blast two sequences, there are identities, positives, and gaps these parameters. I don't know the meaning of positives. could you tell me?

identity blast NCBI • 20k views
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6.2 years ago
Kritika ▴ 260

please refer this

https://community.gep.wustl.edu/wiki/images/2/28/2011_8b_BLASTrv7_rev.pdf

There is also a new field called „Positives‟ which corresponds to the number of amino acids that are either identical between the query and the subject sequence or have similar chemical properties

https://www-bimas.cit.nih.gov/blastinfo/blastexample.html#Posit

Positives : The number and fraction of residues for which the alignment scores have positive values.

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