[Bioperl-l] Retrieving upstream & downstream sequences

[Ross KK Leung]

If I have an accession number for an mRNA/cDNA/gene (e.g.
http://www.ncbi.nlm.nih.gov/nuccore/51980295), I find sometimes if I
retrieve the genbank file and parse /dbxref then I may sometimes be able to
get some extra information but then the page is not readily usable, e.g.

http://www.ncbi.nlm.nih.gov/sites/entrez?db=gene&cmd=Retrieve&dopt=full_repo
rt&list_uids=24377

is there any way to automatically retrieve its upstream & downstream genomic
sequence (e.g. 500bp)?