10.18453/rosdok_id00003758 Venuto, Marzia Tindara Marzia Tindara Venuto http://d-nb.info/gnd/1261330072 Universität Rostock 2021 500 Natural sciences 570 Life science 590 Zoological sciences 2021 en http://purl.uni-rostock.de/rosdok/id00003758 urn:nbn:de:gbv:28-rosdok_id00003758-9 Sialic acids (Sia) are located at the outermost position of glycoproteins. They play a critical role in biological processes. The polysialyltransferases (polySTs) are enzymes producing Sia polymers (polySia). These are important for the brain development. In contrast, little is known about the role of polySia in fish ovaries. We investigated the distribution of the polySTs in teleosts and determined their expression levels in ovaries of two fish species. Furthermore, we observed polySia positive cells in ovaries. The results provide new insights into the role of polySia during oogenesis.