AUTHOR=Fukuda Yasuhiro , Suzaki Toshinobu , Murata Kazuyoshi , Song Chihong TITLE=Novel ultrastructural features of the nucleus of the ancestral dinoflagellate Oxyrrhis marina as revealed by freeze substitution fixation and volume electron microscopy JOURNAL=Frontiers in Protistology VOLUME=3 YEAR=2025 URL=https://www.frontiersin.org/journals/protistology/articles/10.3389/frpro.2025.1512258 DOI=10.3389/frpro.2025.1512258 ISSN=2813-849X