DKK1 (Dickkopf-1): DKK1 is a secreted protein that acts as an inhibitor of the Wnt signaling pathway, playing a critical role in embryonic development, bone formation, and cancer. By binding to LRP5/6 receptors, DKK1 prevents Wnt from activating its signaling pathway, influencing cell fate determination, proliferation, and differentiation. DKK1 is implicated in bone density regulation and osteoporosis, and its expression is associated with various cancers, making it a target for therapeutic intervention....