LRRN2 (Leucine Rich Repeat Neuronal 2): LRRN2 is a member of the leucine-rich repeat family of proteins, which are involved in protein-protein interactions. LRRN2 plays important roles in cell adhesion, signaling, and neuronal development. It is expressed in various brain regions and is believed to contribute to neural circuit formation and synaptic differentiation. Its involvement in neural development and plasticity suggests a potential role in neurological disorders, although its specific functions are still being studied.