Fig. 19.2b  Microtubule organization.

Fig. 19.3  Various structures of tubulin protofilaments.

Fig. 19.7a

Fig. 19.28a  Crossection of Flagella.

Fig. 19.7b

Fig. 19.7c

Fig. 19.8b  Initiation of tubulin polymerization begins at gamma tubulin.