Dear Madam/Sir, Can you tell me, how can I get Entrez ID of arabidopsis for some particular probe id's of microarray by bioconductor ?? Thanks varpal [[alternative HTML version deleted]]

Hi Varpal, These are exposed in the org.At.tair.db package but not in the chip packages. The chip packages (such as ag.db), will all load the org.At.tair.db package though to get the data that they normally expose. So simply loading the appropriate chip package will make all these things available to you. Here is one way that you could use to connect them that assumes you are using the "ag" chip. library(ag.db) ids = c("11986_at","11987_at","11988_at","11989_at") #get the probeset IDs that map to the relevant TAIR accessions. accs = toTable(agACCNUM[ids] ) accs #get the entrez gene IDs that map to the relevant TAIR accessions egs = toTable(org.At.tairENTREZID[accs[,"gene_id"]] ) egs #merge them together. merge(accs, egs) Let us know if you have more questions, Marc On 05/06/2010 02:23 AM, varpal singh wrote: > Dear Madam/Sir, > > Can you tell me, how can I get Entrez ID of arabidopsis for some particular > probe id's of microarray by bioconductor ?? > > Thanks > varpal > > [[alternative HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor > >