I am interested in deviations from standard eukaryotic biological mechanisms:
- Sperm chromatin lacks nucleosomes, and are instead highly condensed by protamines. (most eukaryotic chromatin has chromatin with nucleosomes).
- Camelid and cartilaginous fish antibodies are single-domain (most vertebrates have heavy chain + light chain antibodies).
- Drosophila homologous chromosomes undergo transvection and are tightly paired. (Transvection is not usually observed in eukaryotes.)
These are some of the unique peculiarities I've found among model systems that deviate from "expected" biology. Is there a running database that catalogues unique attributes of different model systems? If not for trivia, I find them extremely inspiring for mechanistic studies!