ProtistologyPublished 20 February 2025Novel ultrastructural features of the nucleus of the ancestral dinoflagellate Oxyrrhis marina as revealed by freeze substitution fixation and volume electron microscopyYasuhiro Fukuda · Toshinobu Suzaki · Kazuyoshi Murata · Chihong SongFrontiers in Eukaryotic Microbiologydoi 10.3389/frpro.2025.1512258