u133x3pENTREZID {u133x3p} | R Documentation

## Map between Manufacturer Identifiers and Entrez Gene

### Description

u133x3pENTREZID is an R environment that provides mappings between manufacturer identifiers and Entrez Gene identifiers.

### Details

Each manufacturer identifier is mapped to a vector of Entrez Gene identifiers. An `NA` is assigned to those manufacturer identifiers that can not be mapped to an Entrez Gene identifier at this time.

If a given manufacturer identifier can be mapped to different Entrez Gene identifiers from various sources, we attempt to select the common identifiers. If a concensus cannot be determined, we select the smallest identifier.

Mappings were based on data provided by:

Entrez Gene:ftp://ftp.ncbi.nlm.nih.gov/gene/DATA/. Built: Source data downloaded from Entrez Gene on Fri Aug 24 23:17:14 2007

Package built: Fri Aug 24 00:03:12 2007

### References

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=gene

### Examples

        # Convert the environment to a list
        xx <- as.list(u133x3pENTREZID)
        # Remove probe identifiers that do not map to any ENTREZID
        xx <- xx[!is.na(xx)]
        if(length(xx) > 0){
            # The ENTREZIDs for the first two elements of XX
            xx[1:2]
            # Get the first one
            xx[[1]]
        }

[Package u133x3p version 2.0.1 Index]