I'm doing some microarray analysis, and I figured out that some probe ids have not any GENE SYMBOL. Am I suppose to delete those probes or let them exist ?
The way I apply annotation info for an Affymetrix HGU133plus2 array after RMA application, is the following:
probes=row.names(expressions) Symbols = unlist(mget(probes, hgu133plus2SYMBOL, ifnotfound=NA)) Entrez_IDs = unlist(mget(probes, hgu133plus2ENTREZID, ifnotfound=NA)) expressions=cbind(probes,Symbols,Entrez_IDs,expressions)
Is something wrong with my code or such behavior is expected ? What do you guys do with these NA genes ?