Figure 12
From: Flagellar central pair assembly in Chlamydomonas reinhardtii
Multiple CPs in pf14 flagella. Standard transmission EM of isolated pf14 axonemes. (a) Axonemes with four CP microtubules are marked. (b, c) Axonemes with two CPs in cross and longitudinal section. When two CPs are present, both always have correct, identical polarities, as seen in the cross section. Arrows point to beak-like projections in doublets 1, 5, and 6, indicating that the section is from the proximal ~1/3 of the flagellum [31].