- Gigantic genome (230 pg DNA/cell)
- There are about 143 chromosomes
- Chromosomes are permanently condensed
- There are no typical histone proteins as in other eukaryotes do to package chromosomal DNA
- DNA contains 5-hydroxymethylmuracil, which replaces a large fraction of the thymidine (RAE, P. M. M. 1976. Hydroxymethyluracil in eukaryote DNA: a natural feature of the Pyrrophyta (dinoflagellates). Science 194: 1062–1064.).
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