Is There An Explaination For Each Of The Pieces Of Blast Output?
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0
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12.0 years ago
agatorano ▴ 50

I was wondering if there was full explanation for each of the pieces of this part of the output.

Lambda     K      H
   0.328    0.141    0.440 

Gapped
Lambda     K      H
   0.267   0.0410    0.140 


Matrix: BLOSUM62
Gap Penalties: Existence: 11, Extension: 1
Number of Hits to DB: 455
Number of Sequences: 0
Number of extensions: 40
Number of successful extensions: 2
Number of sequences better than 100000.0: 1
Number of HSP's better than 100000.0 without gapping: 1
I am confused by this part of the output and was wondering if there was a full explanation anywhere.

Number of HSP's successfully gapped in prelim test: 0
Number of HSP's that attempted gapping in prelim test: 0
Number of HSP's gapped (non-prelim): 1
length of query: 221
length of database: 456,953,620
effective HSP length: 122
effective length of query: 99
effective length of database: 456,953,498
effective search space: 45238396302
effective search space used: 45238396302
T: 9
A: 40
X1: 15 ( 7.1 bits)
X2: 129 (49.7 bits)
X3: 129 (49.7 bits)
S1: 37 (20.3 bits)
S2: 37 (18.9 bits)

I have a lot of educated guesses for most of them but I don't know if I understand the innards of BLAST well enough to be completely sure about any of my assumptions.

I am just curious! The more knowledge the better judgement in the future I say.

Thank you!

blast alignment blastn • 3.4k views
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6
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12.0 years ago
Neilfws 49k

Why make educated guesses when there is ample documentation?

In particular, the handbook and the guide to BLAST statistics.

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This appears to answer a majority of the output in general but not the output that I have posted. Maybe I am not reading the right document?

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Maybe not. Keep trying :) Seriously: what is it that you don't understand? Do you really want to know the meaning of every line in the sample you posted?

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haha I honestly do want to know! I just hate getting information without knowing its purpose.

at least for these:

Number of Sequences: 0 Number of extensions: 40 Number of successful extensions: 2 Number of sequences better than 100000.0: 1 Number of HSP's better than 100000.0 without gapping: 1

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