hgu133aHGID {hgu133a} | R Documentation |
hgu133aHGID mappes probe ids to the internal HomoloGeneIDs used by NCBI to represent sequences (genes)
This is an environment object with key and value pairs. Keys are probe ids and values are NCBI's HomoloGeneIDs. Values are vectors of length 1 or greater depending on whether a given probe id can be mapped to only one or more internal HomoloGeneIDs. NA is assigned to probe ids that can not be mapped to an internal HomoloGeneID at this time.
This environment allows users to like probe ids to HomoloGeneIDs so that the homologous genes of probe ids can be explored using another data package named homology.
Mappings were obtained using data probided by:
Homology built: HomoloGene built date not available.ftp://ftp.ncbi.nih.gov/pub/HomoloGene/hmlg.ftp
LocusLink built: March 3, 2004. ftp://ftp.ncbi.nih.gov/refseq/LocusLink/LL_tmpl.ga
Package built Wed Mar 3 16:27:29 2004
# Convert the environment to a list xx <- as.list(hgu133aHGID) # Remove probe ids that do not map to any HDID xx <- xx[!is.na(xx)] if(length(xx) > 0){ # The HGIDs for the first two element of XX xx[1:2] # Get the first one xx[[1]] }