Hi Jinyan,

Instead of using the microRNA package, have you considered using the 
mirbase.db or the targetscan packages?  The reason I suggest that is 
that I think it is more up-to date on account of being a proper 
annotation package.  After contacting James Reid (who is the maintainer 
of both the mirbase.db and the  targetscan packages), I can tell you 
that mirbase.db is based on hg19 but that the targetscan packages are 
probably based on hg18.  In both cases the data just represents the most 
recent information available.  Below are some links that can help you 
learn more about these other packages:

http://www.bioconductor.org/packages/release/data/annotation/html/mirbase.db.html

http://www.bioconductor.org/packages/release/data/annotation/html/targetscan.Hs.eg.db.html


   Marc




On 05/16/2011 09:06 AM, Jinyan Huang wrote:
> > library("microRNA")
> > sessionInfo()
> R version 2.12.1 (2010-12-16)
> Platform: x86_64-pc-linux-gnu (64-bit)
>
> locale:
> [1] C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] microRNA_1.8.0
>
> loaded via a namespace (and not attached):
> [1] Biobase_2.10.0    Biostrings_2.18.0 IRanges_1.8.9
>
> On Mon, May 16, 2011 at 5:57 PM, Marc Carlson <mcarlson@fhcrc.org 
> <mailto:mcarlson@fhcrc.org>> wrote:
>
>     SessionInfo()
>
>


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