Phosphoserine Detection: Phosphoprotein Positive Control was probed with: Lane 1: mab 1C8 (IgM), 1 g/ml. Lane 2: mab 4A3 (IgM), 1 g/ml. lane 3: mab 4A9 (IgM), 1 g/ml. Lane 4: mab 4H4 (IgM), 1 g/ml. Lane 5: mab 7F12 (IgG), 1 g/ml. Lane 6: mab 16B4 (IgM), 1