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