[galaxy-user] Gene and transcript names from Cuffdiff

Hi all, I am learning how to use Galaxy to analyze my RNA-Seq data. After running cuffdiff, one of the files I got is "transcript differential expression testing". In this file, I can see " gene_id" is something like "XLOC_000001". I am wondering how I can find the name of differentially expressed genes and transcripts. Can anyone help me?????? Thanks in advance. Jiwen