Interaction of several monoclonal antibodies with purified S100 protein (1 µg) from human brain in WB, after native gel electrophoresis using the Ornstein-Davis system. Lane 1 = ab14849, Lane 2 = ab8330, ab Lane 3 = ab10203, Lane 4 = ab8334. The doublet band appears at about 20-21 kD, Interaction of several monoclonal antibodies with purified S100 protein (1 µg) from human brain in WB, after native gel electrophoresis using the Ornstein-Davis system. Lane 1 = ab14849, Lane 2 = ab8330, ab Lane 3 = ab10203, Lane 4 = ab8334. The doublet band appears at about 20-21 kD,