Hi, I am trying to retrieve gene symbol/description with GenBank/EMBL IDs using biomaRt. I was successful with some IDs, but not with others. For example:

> library(biomaRt)

> ensembl = useMart("ensembl",dataset="hsapiens_gene_ensembl")


> getBM(attributes=c('embl', 'description','hgnc_symbol'),   filters = 'embl', values = c('AF133587','AA456140'), mart = ensembl)

      embl                                                          description hgnc_symbol
1 AF133587 rhabdoid tumor deletion region gene 1 [Source:HGNC Symbol;Acc:13437]       RTDR1


As you can see, the first ID returns gene symbol/description successfully, but the 2nd one did not. What is the reason for the 2nd one not working? Is there other ways to get it to work?

Thanks

John
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