Monoclonal mouse antibody to human lactoferrin. To identify the presence of lactoferrin in human milk, other body fluids, cell and tissue substrates and to determine its concentration in techniques as ELISA, indirect immunoperoxidase and indirect immunofluorescence staining and immunoblotting. The optimum working dilution is an assay-related characteristic and should always be determined by titration. For histochemical use optimum dilutions are mostly from 1:20 upwards; in ELISA from 1:100 upwards; in Western blotting from 1:500 upwards. These data should be interpreted as general recommendations only.