Entering edit mode
You can download the genomic sequence from here (I just did): http://ecogene.org/ecodownload/sequence
However, luckily, you can download both the genomic sequence and matched GTF reference from Ensembl. It took a while for me to search the FTP site but I got it in the end. The last Ensembl version to include ASM584v1 appears to have been Ensembl release 21:
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