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   Name: $gb->gene2id()   -   get a feature ID from canonical gene name

   Description:
         Given a GenBank gene name, returns the feature ID (ex. FEATURE123). 
         Returns NULL if no gene exists.

=cut

=head2 $gb->next_locus()

   Name: $gb->next_locus()   -   read the next locus and update the G instance

   Description:
         Reads the next locus.
         the G instance is then updated.

         eg. 
           do{
  
           }while($gb->next_locus());
           #  Enables multiple loci analysis.        

=cut

=head2 $gb->clone()

   Name: $gb->clone()   -   create a copy of the G instance

   Description:
         Returns cloned G instance, which is a new G instance with
         identical data. 

=cut

=head2 $gb->del_key()

   Name: $gb->del_key()   -   delete a data object from G instance

   Description:
         Given a object, deletes it from the G instance structure
         eg. $gb->del_key('FEATURE1'); # deletes 'FEATURE1' hash

=cut

=head2 $gb->reverse_strand()

   Name: $gb->reverse_strand()   -   create a G instance on complementary DNA strand

   Description:
         Returns a G instance for the complementary DNA strand. 
         All information, including the sequence and feature annotations
         is switched to reflect that of the complementary DNA strand. 
         In other words, gene order, direction of genes (either direct or 
         complement), and positions are reversed. 

   Usage: 
      $new = $gb->reverse_strand();

=cut

=head2 $gb->relocate_origin()

   Name: $gb->relocate_origin()   -   create a G instance starting at given position

   Description:
         Returns a G instance starting at given position, assuming circular
         chromosome. All information, including the sequence and feature 
         annotations are moved. Note that the given position is Perl position
         and NOT GenBank position. GenBank position -1 equals Perl position.

   Usage:
      $new = $gb->relocate_origin($position);

      This method would probably be most useful in conjunction with
      find_ori_ter(), to create a G instance starting from the 
      origin of replication, as follows:

        ($ori, $ter) = find_ori_ter($gb);
        $new = $gb->relocate_origin($ori);

      Several of related methods can be concatenated. For example, 
      to create a GenBank file of complementary DNA strand starting
      from the origin of replication, do the following:

        $gb->reverse_strand()->relocate_origin($ori)->output("out.gbk");

=cut


=head1 AUTHOR

Kazuharu Arakawa, gaou@sfc.keio.ac.jp

=cut

1;