Two pools of cortical actin are observable in multiciliated cells. (A and B) Apical actin (A) forms a meshworklike network in the same plane as basal bodies, and a second pool of actin (B) localizes slightly subapically. (C and E) A late cell depicting the highly organized subapical pool of actin. The dotted line in C indicates the cross section shown in E. (D) Subapical actin in a multiciliated cell from an early embryo. (F) A diagram of subapical actin interactions with striated rootlets and basal bodies. Posterior is to the right in all panels.