Polysialic acid is present in mammalian semen as a posttranslational modification of NCAM and the polysialyltransferase ST 8 SiaII

From the Institute of Biochemistry, Faculty of Medicine, Justus-Liebig-University, Germany; Clinic of Obstetrics, Gynecology and Andrology for Small and Large Animals, Justus-Liebig-University, Frankfurter Str. 106, 35392 Giessen, Germany; Leibniz Institute for Zoo and Wildlife Research, Alfred-Kowalke-Strasse 17, 10315 Berlin, Germany; Institute of Cellular Chemistry, Hannover Medical School, Germany and the 5 Institute of Anatomy and Cell Biology, Faculty of Medicine, Justus-Liebig-University, Giessen, Germany