perl应用：ＤＮＡ互补序列的获取
sub revcom{# A subroutine to compute the reverse complement of DNA sequence # 一个获取DNA互补序列的子程序my($dna)=@_;print $dna."\n";my ($revcom)=reverse($dna);$revcom=~tr/ACGTacgt/TGCAtgca/;return $revcom;}my $plus_dna="ATATTATATATAGCGC";my $the_result;$the_result=revcom($plus_dna);print $the_result;