Hi all,
           I am trying to download dN/dS values for human genes from
ensemble using biomaRt. I have used codes from the website :

http://www.r-bloggers.com/biomart-and-biomart/

> library("biomaRt")
> mart <- useMart(biomart="ensembl", dataset="hsapiens_gene_
ensembl")
> genes <- read.csv("file.txt") (this file contains hgnc gene symbols for
Homo sapiens)
> results <- getBM(attributes = c("ensembl_gene_id","hsapiens_dn"),values =
genes$hsapiens_dn, mart = mart)

But all the values of hsapiens_dn are shown to be "NA". The first few lines
of the output

> head(results,10)
   ensembl_gene_id hsapiens_dn
1  ENSG00000215781          NA
2  ENSG00000243259          NA
3  ENSG00000225566          NA
4  ENSG00000189096          NA
5  ENSG00000215750          NA
6  ENSG00000212884          NA
7  ENSG00000212886          NA
8  ENSG00000229617          NA
9  ENSG00000241176          NA
10 ENSG00000215705          NA

Can anyone please tell me where am I going wrong ? . Thanks in advance for
any suggestions

-- 
Graduate Student,
Laboratory of Computational Biology,
Center For DNA Fingerprinting And Diagnostics,
4-1-714 to 725/2, Tuljaguda complex
Mozamzahi Road, Nampally,
Hyderabad-500001

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