The sequence is:[% bio_seq.seq %]

##</code><code>##

sub bioseq :Global {  
  my ( $self, $c ) = @_;
  my $bio_seq_obj = Bio::Seq->new();
  # ... a lot of stuff, finally this:
  $c->{stash}{bio_seq} = $bio_seq_obj;
}

##</code><code>##

__PACKAGE__->config(
    # some config ...
    expose_methods => [qw/colorised_seq_features/],
);

# for testing purposes
sub colorised_seq_features {
  return 'testing, testing, 1,2';
} 

##</code><code>##

The sequence is: [% colorised_seq_features(bio_seq) %]