The present application describes a monoclonal antibody selected from the
group consisting of monoclonal antibody DS6, monoclonal antibodies that
specifically bind to the antigen or epitope bound by monoclonal antibody
DS6, and fragments of the foregoing that specifically bind to the antigen
or epitope bound by monoclonal antibody DS6. Methods of use of such
antibodies and the isolated antigen bound by such antibodies are also
described.