Functions in cell-cell adhesion, cell migration and axon guidance. Mediates cell-cell adhesion via its interactions with ADGRL3 and probably also other latrophilins that are expressed at the surface of adjacent cells. May play a role in the migration of cortical neurons during brain development via its interaction with UNC5D. Mediates axon growth cone collapse and plays a repulsive role in neuron guidance via its interaction with UNC5D, and possibly also other UNC-5 family members. Plays a role in fibroblast growth factor-mediated signaling cascades. Required for normal organization of the cardiac basement membrane during embryogenesis, and for normal embryonic epicardium and heart morphogenesis. Self-associates (via leucine-rich repeats), giving rise to homooligomers. Interacts with FGFR1. Interacts with FGFR2. Interacts (via extracellular domain) with ADGRL1/LPHN1. Interacts (via extracellular domain) with ADGRL3 (via olfactomedin-like domain). Interacts (via extracellular domain) with UNC5D (via the first Ig-like domain). Can also interact (via extracellular domain) with UNC5B, but with much lower affinity. Interacts (via extracellular domain) with FN1. Proteolytic cleavage gives rise to a shedded ectodomain. Expressed in pancreas, skeletal muscle, brain, and heart. N-glycosylated. Proteolytic cleavage in the juxtamembrane region gives rise to a soluble ectodomain. Cleavage is probably effected by a metalloprotease.