Equine trypsin: purification and development of a radio-immunoassay Sigrid Grulke, Ginette Deby-Dupont, Monika Gangl, Thierry Franck, Carol Deby and Didier Serteyn Vet. Res., 34 3 (2003) 317-330 DOI: 10.1051/vetres:2003007