$mech->post(
    $hypermutUrl,
    'FORMAT'    => 'FASTA',
    'ALIGNMENT' => '',

##     'upfile1' => '', (file)
##   [ $file, $filename, Header => Value... ],
##   [ undef, $filename, Header => Value,..., Content => $content ],
##   [ $filepath, $filenameInHttpHeaderUnrelatedToFilepath, ... ],
    [ $seqfile , "mahSeqFile$$.fasta" ],
    'INN'               => '',
    'OUT'               => '',
    'MUTUPSTREAM'       => '',
    'MUTFROM'           => 'G',
    'MUTTO'             => 'A',
    'MUTTO'             => 'A',
    'MUTDOWNSTREAM'     => 'RD',
    'ENFORCE'           => 'DESCENDANT',
    'CONTROLUPSTREAM'   => '',
    'CONTROLFROM'       => 'G',
    'CONTROLTO'         => 'A',
    'CONTROLDOWNSTREAM' => 'YN|RC',
    'Analysis'          => 'All',
    'submit'            => 'Run',

  )