Answers.Body: <p>Whenever you are wondering about things like this, just look up the identifier on the Ensembl web page. If you <a href="http://www.ensembl.org/Mus_musculus/Gene/Idhistory?g=ENSMUSG00000083840" rel="nofollow noreferrer">look up</a> <code>ENSMUSG00000083840</code>, you will see:</p>
  
  <blockquote>
    <p>This identifier is not in the current EnsEMBL database</p>
  </blockquote>
  
  <p>In this case, it doesn't seem to have been replaced by anything and it wasn't a protein coding gene, so it looks like it was simply a wrong annotation which has been removed. </p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-04-19T08:54:34.273Z
Answers.LastActivityDate: 2018-04-20T07:35:29.153Z
Answers.LastEditDate: 2018-04-20T07:35:29.153Z
Answers.UserDisplayName: terdon
Body: <p>I am supplying to <code>BioMart</code> <code>81</code> <code>ensemblID</code>s, but getting <code>80</code> results where <code>1</code> <code>ensembleID</code>: <code>ENSMUSG00000083840</code> is absent. What does it mean if <code>BioMart</code> can not find the gene? Does it mean that it is a non-coding one or that there is just no symbol attached to it? Here is my <code>BioMart</code> query:</p>
  
  <pre><code>library('biomaRt')
  mart &lt;- useDataset("mmusculus_gene_ensembl", useMart("ensembl"))
  genes &lt;- rownames(mat)
  G_list &lt;- getBM(filters= "ensembl_gene_id", attributes= 
  c("ensembl_gene_id","mgi_symbol","description"),values=genes,mart= mart)
  </code></pre>
  
Tags: <r><biomart>
Title: BioMart does not return a result
ThreadText: # BioMart does not return a result
  
  (Asked by: username_0 on 2018-04-18)
  
  I am supplying to `BioMart` `81` `ensemblID`s, but getting `80` results where `1` `ensembleID`: `ENSMUSG00000083840` is absent. What does it mean if `BioMart` can not find the gene? Does it mean that it is a non-coding one or that there is just no symbol attached to it? Here is my `BioMart` query:
  
  ```
  library('biomaRt')
  mart <- useDataset("mmusculus_gene_ensembl", useMart("ensembl"))
  genes <- rownames(mat)
  G_list <- getBM(filters= "ensembl_gene_id", attributes= 
  c("ensembl_gene_id","mgi_symbol","description"),values=genes,mart= mart)
  
  ```
  
  **Tags:** r, biomart
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2018-04-19. Score: 9 | Accepted answer
  
  Whenever you are wondering about things like this, just look up the identifier on the Ensembl web page. If you [look up](http://www.ensembl.org/Mus_musculus/Gene/Idhistory?g=ENSMUSG00000083840) `ENSMUSG00000083840`, you will see:
  
  > This identifier is not in the current EnsEMBL database
  
  In this case, it doesn't seem to have been replaced by anything and it wasn't a protein coding gene, so it looks like it was simply a wrong annotation which has been removed.
  
  
  ---
  
  