Enables signaling receptor binding activity. Involved in several processes, including negative regulation of neuron apoptotic process; ossification involved in bone remodeling; and positive regulation of neuron differentiation. Predicted to be active in extracellular space. Biomarker of Parkinson's disease. Human ortholog(s) of this gene implicated in Parkinson's disease and bone disease (multiple). Orthologous to human GDF5 (growth differentiation factor 5). [provided by Alliance of Genome Resources, Apr 2022]