>gi|1870687|gb|U77948.1|HSU77948 Human Bruton's tyrosine kinase-associated protein-135 mRNA,
>gi|22415887|emb|AL683818.12| Mouse DNA sequence from clone RP23-229B23 on chromosome 4, complete

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if($current_subject =~ /\b\Q$filter\E\b/)  # filter and get exact name