Twenty-five hybridomas secreting monoclonal antibodies against human α1-antitrypsim have been produced by the cell-fusion techmque (Kóhler and Milstein, 1976). All antibodies are specific for α1-antitrypsim and carry γ1-antitrypsim heavy chains and κ light chains. Inhibition experiments showed that these monoclonal antibodies define three independent antigenic regions on the α1-antitrypsim molecule; one of these domains appears to be involved in the interaction between α1-antitrypsim and trypsin. In addition, one monoclonal antibody, AATY39, was used to develop an enzyme-linked immunosorbent assay capable of detecting low levels of α1-antitrypsim in the range of 1 to 2 ng/ml.

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