Enables protein homodimerization activity. Involved in central nervous system myelin formation; positive regulation of gastrulation; and regulation of nervous system development. Acts upstream of or within cardiac cell fate specification; cardiac muscle cell proliferation; and gastrulation with mouth forming second. Located in cytoplasm; neuron projection; and nucleus. Is integral component of plasma membrane. Is expressed in several structures, including branchial arch; central nervous system; forelimb bud; future brain; and somite. Human ortholog(s) of this gene implicated in essential tremor 5. Orthologous to human TENM4 (teneurin transmembrane protein 4). [provided by Alliance of Genome Resources, Apr 2022]