Hi, I cant get information about the Mus.musculus package. The link on the page is dead http://www.bioconductor.org/packages/2.11/data/annotation/html/Mus.musculus.html http://www.bioconductor.org/packages/2.11/data/annotation/manuals/Mus.musculus/man/Mus.musculus.pdf best, ido