hgu133bSYMBOL {hgu133b.db} | R Documentation

## Map between Manufacturer Identifiers and Gene Symbols

### Description

hgu133bSYMBOL is an R object that provides mappings between manufacturer identifiers and gene abbreviations.

### Details

Each manufacturer identifier is mapped to an abbreviation for the corresponding gene. An `NA` is reported if there is no known abbreviation for a given gene.

Symbols typically consist of 3 letters that define either a single gene (ABC) or multiple genes (ABC1, ABC2, ABC3). Gene symbols can be used as key words to query public databases such as Entrez Gene.

Mappings were based on data provided by: Entrez Gene ( ftp://ftp.ncbi.nlm.nih.gov/gene/DATA ) on 2007-Aug23

### References

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

### Examples

            x <- hgu133bSYMBOL
            # Get the probe identifiers that are mapped to a gene symbol
            mapped_probes <- mappedkeys(x)
            # Convert to a list
            xx <- as.list(x[mapped_probes])
            if(length(xx) > 0) {
              # Get the SYMBOL for the first five probes
              xx[1:5]
              # Get the first one
              xx[[1]]
            }

[Package hgu133b.db version 2.0.2 Index]