Only when a Torrent Suite™ Software upgrade requires that reference indices be rebuilt, the upgrade involves these steps:

1. The upgrade installs only E. coli DH10B and moves other references into the Obsolete Reference Sequences table.

2. When you do Rebuild All Now and the previously obsolete references are copied back to the main Reference Sequences section.

3. The previously obsolete references also remain in the Obsolete Reference Sequences table.