the antibody is an antagonist which binds to OPGbp of Figures 4 A-F (SEQ ID NO: 4) and inhibits OPGbp mediated osteoclastogenesis and/or bone resorption.Claims 2 to 10 were directed to preferred embodiments of claim 1 and read as claims 2-6, 8, 9, 11 and 12 as granted, except for deletion of the term or fragment thereof.XI. The following documents are cited in the present decision:CD1a: JP 0978