A novel protein binding to osteoclastogenesis inhibitory factor (OCIF) (OCIF-binding molecule； OBM). A DNA encoding the above protein； a protein having theamino acid sequence encoded by this DNA； a process for producing this proteinby the genetic engineering technique； and medicinal compositions containingthis protein. A method for screening a substance regulating the expression ofthe above protein, a substance inhibiting or modifying the biological activityof the above protein, or a receptor binding to the above protein and thusmediating its function with the use of the above protein and the DNA thereof；substances thus obtained； and medicinal compositions containing the substancesthus obtained. An antibody against the above protein； a method for assayingthe above protein by using the antibody； and drugs containing the antibody.
