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Comparison of the specific activity of the recombinant mAbs in HAV neutralization. Serial dilutions from 1/20 to 1/640 of the milk samples (initially diluted to the concentration of 2.5 mg/ml) from two transgenic lines 9 and 14 (mice 9, 9–49, 14–43), and a female non-transgenic mouse (negative control) were assayed with HAV JN strain. The CHO-derived HAIgG78 (2.5 mg/ml) antibody, was used as the positive control
