Spindle fibre is made of
Microtubules are hollow cylindrical structure built from tubulin protein. The spindle fibers, which are involved in the separation of replicated chromosomes during mitosis are made up of microtubules.
Humulin is the name give to human insulin that is produced from recombinant DNA technology utilizing a non-pathogenic laboratory strain of Escherichia coli.
Intermediate filaments are cytoskeletal components found in the cells of vertebrate animal species, and perhaps also in other animals, fungi, plants, and unicellular organisms.
Flagellin is a globular protein that arranges itself in a hollow cylinder to form the filament in the bacterial flagellum.