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NC_014171.1 RefSeq gene 14311 14425 . + . ID=NC_014171.1:rrs_1;locus_t
+ag=BMB171_C5091;db_xref=GeneID:9190898
NC_014171.1 RefSeq exon 14311 14425 . + . ID=NC_014171.1:rrs_1:unknown
+_transcript_1;Parent=NC_014171.1:rrs_1;gbkey=rRNA;locus_tag=BMB171_C5
+091 ;product=5S ribosomal RNA;db_xref=GeneID:9190898;exon_number=1

NC_014171.1 RefSeq gene 14459 15460 . - . locus_tag=BMB171_C0007;db_xr
+ef=GeneID:9190899
NC_014171.1 RefSeq CDS 14462 15460 . - 0 locus_tag=BMB171_C0007;transl
+_table=11;product=hypothetical protein;protein_id=YP_003662545.1;db_x
+ref=GI:296500845;db_xref=GeneID:9190899;exon_number=1

# Task: Extract GeneID-Number and gene information

...
while ( ($GeneID, $BMB) = each %hash) {
print "$GeneID => $BMB[0]\n";
}