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Structures of the IgG4 biplex lateral flow tests. (A) Identification of the components of the biplex strips and the appearance of the Wb123 (0.8 mg/ml), Ov16 (1 mg/ml), and IgG control lines following the movement of sample and anti-human IgG4 in buffer toward the absorbent pad. (B) Schematic of the biplex test in the prototype cassette with positive results shown in the results window. O, W, and C indicate the locations of the Ov16, Wb123, and control lines, respectively.
