Predicted to enable ephrin receptor binding activity. Predicted to be involved in ephrin receptor signaling pathway; generation of neurons; and trans-synaptic signaling by trans-synaptic complex, modulating synaptic transmission. Predicted to act upstream of or within T cell costimulation; adult walking behavior; and axon choice point recognition. Is active in glutamatergic synapse. Is integral component of postsynaptic density membrane. Orthologous to human EFNB3 (ephrin B3). [provided by Alliance of Genome Resources, Apr 2022]