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         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();

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=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");

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=head1 AUTHOR

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

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