consideration of literature describing striated rootlet structure in a wide variety of ciliated and flagellated cells led to the speculation that striated rootlets arose subsequent to primitive flagella and likely evolved along two major pathways : a narrow-period rootlet similar to those discussed above , which developed from the microtubule rootlets of algal flagellates , and a wide-band , contractile rootlet which originated from the primitive interbasal body connector prominent in both algal and protozoan species .
C0007634
cells
C0026046
microtubule