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 play a crucial role in cell adhesion, signaling, and interactions with the extracellular matrix. ELFN2 is particularly important for neural development and synaptic plasticity, where it may help regulate neuronal connections in the brain.