<p>NP_420767 is represented by the non-redundant refSeq protein WP_010919826, which has the same amino acid sequence. This is not very clearly annotated, but if you scroll down to the sequence in the GenPept entry for NP_420767, you'll see the following:</p>

<pre><code>CONTIG      join(WP_010919826.1:1..799)
</code></pre>

<p>See <a href="https://www.ncbi.nlm.nih.gov/refseq/about/nonredundantproteins" rel="nofollow noreferrer">here</a> for more info.</p>

CC BY-SA 3.0
2017-07-25T12:00:23.260Z
Ah, I understand.. And in the list after clicking on "identical proteins" on the "WP_010919826.1" site, "NP_420767" gets listed.
Matthias F.
CC BY-SA 3.0
2017-07-25T11:27:52.257Z
2017-07-25T11:27:52.257Z
heathobrien
<p>Can anyone explain me, why I don't find a specific protein with a blast that was took before from the NCBI refseq database?</p>

<p>Specifically, I was trying to blast the protein with the accession number "NP_420767" and its sequence, respectively, however that protein does not show up in the results. It not only happens when the standard options are chosen, but also, when "Reference proteins (refseq_protein)" as database in the blast options is selected.</p>

<p>I am really puzzled by that.. Shouldn't blast show the initial refseq entry in the results list as it is part of the refseq database and has the same sequence?</p>

CC BY-SA 3.0
2017-07-25T12:54:05.813Z
Relevant: [Duplicate long hits from PSI-BLAST](//bioinformatics.stackexchange.com/a/831)
terdon
<blast><refseq>
blasting a refseq protein does not show the protein in the result set
# blasting a refseq protein does not show the protein in the result set

(Asked by: username_0 on 2017-07-25)

Can anyone explain me, why I don't find a specific protein with a blast that was took before from the NCBI refseq database?

Specifically, I was trying to blast the protein with the accession number "NP\_420767" and its sequence, respectively, however that protein does not show up in the results. It not only happens when the standard options are chosen, but also, when "Reference proteins (refseq\_protein)" as database in the blast options is selected.

I am really puzzled by that.. Shouldn't blast show the initial refseq entry in the results list as it is part of the refseq database and has the same sequence?

**Tags:** blast, refseq
> **Comments:**
> **username_1**: Relevant: [Duplicate long hits from PSI-BLAST](//bioinformatics.stackexchange.com/a/831)  

---

## 1 answers

### Answer by username_2 on 2017-07-25. Score: 2 | Accepted answer

NP_420767 is represented by the non-redundant refSeq protein WP_010919826, which has the same amino acid sequence. This is not very clearly annotated, but if you scroll down to the sequence in the GenPept entry for NP_420767, you'll see the following:
CONTIG      join(WP_010919826.1:1..799)

See here for more info.

> **Comments:**
> **username_0**: Ah, I understand.. And in the list after clicking on "identical proteins" on the "WP_010919826.1" site, "NP_420767" gets listed.  

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