Simplify the following text for a Grade 12 native English-speaking person.
Original: Although classified as eukaryotes , the dinoflagellate nuclei are not characteristically eukaryotic , as they lack histones , nucleosomes and maintain continually condensed chromosomes during mitosis .
Simplified: Although classified as eukaryotes , the dinoflagellate nuclei lack some key features of eukaryotic nuclei .