[BioC] question about biomaRt problem

[rong [guest]]

Hello,
when I use the biomaRt package from R/bioconductor,
there appears a problem:
library("biomaRt")
ensembl=useMart("ensembl",dataset="hsapiens_gene_ensembl")
refseqinds=c("NM_005359","NM_000546")
ipro=getBM(attributes=c("refseq_dna","interpro","interpro_description"),filters="refseq_dna",values=refseqinds,mart=ensembl)

ipro
[1] refseq_dna interpro interpro_description <0 rows> (or 0-length row.names)

Can anyone tell me what's the problem? Are there any other way to retrieve the gene name from refseq gene ID?

 -- output of sessionInfo(): 

> sessionInfo()
R version 2.14.1 (2011-12-22)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] biomaRt_2.10.0

loaded via a namespace (and not attached):
[1] RCurl_1.91-1 tools_2.14.1 XML_3.9-4   


--
Sent via the guest posting facility at bioconductor.org.