An Arg-Gly-Asp-directed receptor on the surface of human melanoma cells exists in a divalent cation-dependent functional complex with the disialoganglioside GD2 - Cheresh, D A; Pytela, R; Pierschbacher, M D; Klier, F G; Ruoslahti, E; Reisfeld, R A (J Cell Biol, 1987)