Lin7A, also as known as MALS1 or VELI1, belongs to the lin-7 family. This protein contains 1 L27 domain and 1 PDZ (DHR) domain. It plays a role in establishing and maintaining the asymmetric distribution of channels and receptors at the plasma membrane of polarized cells. The tripartite complex composed of LIN7 (LIN7A, LIN7B or LIN7C), CASK and APBA1 may have the potential to couple synaptic vesicle exocytosis to cell adhesion in brain.