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Neural Cell Adhesion Molecule 1 （NCAM-1）, a multifunctional member of the immunoglobulin superfamily, is expressed on the surfaces of neurons, glial cells, skeletal muscle, and natural killer cells. NCAM-1 plays a role in cell-cell adhesion and is crucial for the development of the nervous system. It is also involved in the expansion of T cells and dendritic cells, which are key players in immune surveillance.