In all cells of all domains of life (archaea, bacteria, eukaryotes) a cytoskeleton is found (notably in all eukaryotic cells, which include human, animal, fungal and plant cells). The cytoskeletal systems of different organisms are composed of similar proteins.n eukaryotes, the cytoskeletal matrix is a dynamic structure composed of three main proteins, which are capable of rapid assembly or disassembly dependent on the cell's requirements.