$Text =~ s/$Find$/$Link/g;

##</code><code>##

    $Text =~ s/$Find/$Link/;

##</code><code>##

<a href="http://www.ncbi.nlm.nih.gov/sites/entrez?db=gene&term=LOC100282561" target="_blank">LOC100282561</a>  [Source:RefSeq peptide;Acc:NP_001148941]