Rather than writing a subroutine to do the job, you could use Perl's quoting constructs. They also avoid the need to escape the double quotes you are wrapping around the string.
$ perl -le '
> $seq_num = 1234;
> $quoted_seq_num = qq{"$seq_num"};
> print qq{$seq_num - $quoted_seq_num};'
1234 - "1234"
$
The code would become
$return_val = system($grph_gen_multi_seq,
$data_source_contents[2],
qq{"$data_source_contents[2]"},
$seq_num,
qq{"$seq_num"},
$data_source_contents[1]);
Cheers,
JohnGG
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