| http://www.w3.org/ns/prov#value | - A polypeptide reagent can be used for detecting the presence of anti-Helicobacter antibodies in a sample, e.g., a blood sample, while an antibody of the invention can be used for screening a sample, such as a gastric extract or biopsy sample, for the presence of Helicobacter polypeptides. [0093] For use in diagnostic methods, the reagent (e.g., the antibody, polypeptide, or polypeptide derivative
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