This invention relates to the finding that collagen peptides bind to the osteoclast-associated receptor (OSCAR) and stimulate the activation and/or differentiation of OSCAR expressing cells, such as osteoclasts and osteoclast precursor cells. Collagen peptides are described which may be useful in the modulation of the differentiation and/or activation of OSCAR expressing cells, for example in the treatment of bone defects and disorders characterized by altered differentiation and/or activation of OS-CAR expressing cells.
