Predicted to enable kinase binding activity. Predicted to be involved in synaptic membrane adhesion. Predicted to act upstream of or within homophilic cell adhesion via plasma membrane adhesion molecules and positive regulation of inhibitory postsynaptic potential. Is active in GABA-ergic synapse and postsynaptic specialization of symmetric synapse. Orthologous to human IGSF9B (immunoglobulin superfamily member 9B). [provided by Alliance of Genome Resources, Apr 2022]