Answers.Body: <p>This is possibly a wild goose chase, but a lot of searching led me to this sample: </p>
  
  <p><a href="https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSM2536852" rel="noreferrer">https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSM2536852</a></p>
  
  <p>Which appears to exhibit accessions of the right format. This in turn leads to the platform:</p>
  
  <p><a href="https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GPL22166" rel="noreferrer">https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GPL22166</a></p>
  
  <p>Which is a custom spotted cDNA array, which the metadata seems to suggest is a human platform.</p>
  
  <p>The full annotation table gives gene symbols and Entrez IDs for most of the probes on the array:</p>
  
  <p><a href="https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?view=data&amp;acc=GPL22166&amp;id=53508&amp;db=GeoDb_blob144" rel="noreferrer">https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?view=data&amp;acc=GPL22166&amp;id=53508&amp;db=GeoDb_blob144</a></p>
  
  <p>To take the example of the first line of your results:</p>
  
  <pre><code>ID          ORF     Entrez gene SEQUENCE
  SP_v2 4634  ETNK1   55500       AAAGCAGCTTCATCTTTCAAAATTGATTTGCTCTGGTTTT
  </code></pre>
  
  <p>The Entrez Gene record for that ID matches up:</p>
  
  <p><a href="https://www.ncbi.nlm.nih.gov/gene/?term=55500" rel="noreferrer">https://www.ncbi.nlm.nih.gov/gene/?term=55500</a></p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-07-27T12:27:29.010Z
Answers.LastActivityDate: 2017-07-27T12:27:29.010Z
Answers.UserDisplayName: sjcockell
Body: <p>I am a student trying to analyze GEO2r datas for one of my courses.
  The IDs given in the output are different for different series. I need to convert all of them to a similar format.</p>
  
  <p>In this process I encountered the following type of ID which I don't know its origin:</p>
  
  <pre><code>”ID"    "logFC"
  "SP_v2 4634"    "-0.9897758"
  "SP_v2 3382"    "-0.8391782"
  "SP_v2 4210"    "-1.1693583"
  "SP_v2 2117"    "-1.0504727"
  "SP_v2 3488"    "-0.9756444"
  "SP_v2 1128"    "-0.8289103"
  "SP_v2 2735"    "-0.8629999"
  ...
  </code></pre>
  
  <p>Each one of the rows represent a single gene.
  My question is that what is this ID? The GEO accession is GSE97750.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-07-27T11:40:43.293Z
Comments.Text: Looks like some home made accession code, from which GEO set is it?
Comments.UserDisplayName: benn
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-07-27T12:28:34.003Z
Comments.Text: The GEO accession is GSE97750
Comments.UserDisplayName: hhoomn
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-07-27T12:33:45.430Z
Comments.Text: Yeah it is a custom array. Annotation can be found in the platform (GPL22166) data table. See answer by sjockell.
Comments.UserDisplayName: benn
Tags: <identifiers>
Title: What database do gene IDs starting with sp_v2 refer to?
ThreadText: # What database do gene IDs starting with sp_v2 refer to?
  
  (Asked by: username_0 on 2017-07-27)
  
  I am a student trying to analyze GEO2r datas for one of my courses.
  The IDs given in the output are different for different series. I need to convert all of them to a similar format.
  
  In this process I encountered the following type of ID which I don't know its origin:
  
  ```
  ”ID"    "logFC"
  "SP_v2 4634"    "-0.9897758"
  "SP_v2 3382"    "-0.8391782"
  "SP_v2 4210"    "-1.1693583"
  "SP_v2 2117"    "-1.0504727"
  "SP_v2 3488"    "-0.9756444"
  "SP_v2 1128"    "-0.8289103"
  "SP_v2 2735"    "-0.8629999"
  ...
  
  ```
  
  Each one of the rows represent a single gene.
  My question is that what is this ID? The GEO accession is GSE97750.
  
  **Tags:** identifiers
  
  > **Comments:**
  > **username_1**: Looks like some home made accession code, from which GEO set is it?  
  > **username_0**: The GEO accession is GSE97750  
  > **username_1**: Yeah it is a custom array. Annotation can be found in the platform (GPL22166) data table. See answer by sjockell.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2017-07-27. Score: 5 | Accepted answer
  
  This is possibly a wild goose chase, but a lot of searching led me to this sample:
  
  <https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSM2536852>
  
  Which appears to exhibit accessions of the right format. This in turn leads to the platform:
  
  <https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GPL22166>
  
  Which is a custom spotted cDNA array, which the metadata seems to suggest is a human platform.
  
  The full annotation table gives gene symbols and Entrez IDs for most of the probes on the array:
  
  <https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?view=data&acc=GPL22166&id=53508&db=GeoDb_blob144>
  
  To take the example of the first line of your results:
  
  ```
  ID          ORF     Entrez gene SEQUENCE
  SP_v2 4634  ETNK1   55500       AAAGCAGCTTCATCTTTCAAAATTGATTTGCTCTGGTTTT
  
  ```
  
  The Entrez Gene record for that ID matches up:
  
  <https://www.ncbi.nlm.nih.gov/gene/?term=55500>
  
  
  ---
  
  