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Enzyme immunoassay of gastrin releasing peptide (GRP)-like immunoreactivity in milk.

A sensitive and specific enzyme immunoassay (EIA) for gastrin releasing peptide (GRP)-like immunoreactivity was developed using enzyme-labeled antigen. The synthetic carboxy-terminal fragment of human GRP(12-27) was conjugated with beta-D-galactosidase for EIA. The minimum amount of GRP-like immunoreactivity detectable by this method was 0.24 femtomol/well (6 picomol/liter). The level of GRP-like immunoreactive substance in bovine foremilk was about 150 nanomol/liter, the level of which was more than hundredfold higher than that in normal milk or calf serum.