Enables collagen binding activity. Involved in several processes, including negative regulation of neuron projection development; neuron remodeling; and response to lithium ion. Located in plasma membrane. Biomarker of brain ischemia. Human ortholog(s) of this gene implicated in relapsing-remitting multiple sclerosis. Orthologous to human CSPG4 (chondroitin sulfate proteoglycan 4). [provided by Alliance of Genome Resources, Apr 2022]