The bacterial flagellum is long, filamentous and protoplasmic appendage that arise in the cell envelope. In the bacterial flagella instead of 9+2 arrangement of tubulin there is simply a single filament of globular protein called flagellin.
Pilin : It is a distinct protein present is bacteria as sex pili or F-pilin and takes part in conjugation.
Tubulin : These are the protein subunits from which microtubules are assembled.
Bacterin : Is a vaccine prepared from bacteria.