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  1. or download this
    subtype 'DNAString'
  => as Str
  => where { $_ && $_=~/^[AGCTN]+$/i}
  => message {"Not a DNA string: only AGCT or N allowed and cannot be 
+empty"};
  2. or download this
    use MyApp::MooseX::MyTypes:
has sequence => (
  isa      => 'DNAString',
);
  3. or download this
    coerce 'DNAString'
  => from duck_type( ['seq'] )
  => via { $_->seq };
  4. or download this
    use MyApp::MooseX::MyTypes:
has sequence => (
  isa      => 'DNAString',
  coerce   => 1, 
);