Predicted to enable cell-cell adhesion mediator activity. Predicted to act upstream of or within dendrite development; homophilic cell adhesion via plasma membrane adhesion molecules; and regulation of synapse organization. Predicted to be located in axon; dendrite; and inhibitory synapse. Predicted to be active in neuron projection. Orthologous to human IGSF9 (immunoglobulin superfamily member 9). [provided by Alliance of Genome Resources, Apr 2022]