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<INPUT TYPE="submit" NAME="value" VALUE="Run BLAST">

my $response = $browser->post( $URL,
    [ 'Algorithem' => 'blastx', 
...
      'QueryText' => $sequence, 
    ]
);

my $response = $browser->post( $URL,
    [ 'Algorithem' => 'blastx', 
...
      'value' => 'Run BLAST', 
    ]
);