ELFN2 (Extracellular Leucine-Rich Repeat and Fibronectin Type III Domain Containing 2): ELFN2 is a gene that encodes a protein featuring leucine-rich repeat and fibronectin type III domains. These domains are important for cell adhesion, signaling, and interactions with the extracellular matrix. ELFN2 is especially significant for neural development and synaptic plasticity, where it may help regulate neuronal connections in the brain.