join will happily slurp up your list. You need a loop of some kind. How's this? 
foreach (grep $_->[0] eq 'EMBL') {
    print OUT "DR EMBL;$_->[0];$_->[1];-.\n";
}

[download]
Sorry, no map in there, but I don't think you need it. :)

Update: Juerd caught a typo. Fixed!

In reply to Re: put only 2 elements in a line by chromatic
in thread put only 2 elements in a line by agustina_s

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