Talk about intermediate filaments.

Have intermediate diameter about `10-11 nm, found in animal cells but not in plant cells, radiate through the cytoplasm and are connected to other cytoskeleton structures by thick bridges made up of proteins, which are filamentous proteins that have two binding sites each for cytoskeleton element. They are quite heterogenous since they are made up of more than 50 distinct types of proteins, grouped in six different classes depending on aa, some are keratins, desmins, and lamins.