part of part of axoneme cellular anatomical entity cellular anatomical structure axonemal central apparatus krc GO:1990716 2015-03-27T22:33:23Z cellular_component Part of the 9+2 axoneme, that occurs in most motile cilia, consisting of the pair of two single central microtubules and their associated structures which include the central pair projections, the central pair bridges linking the two tubules, and the central pair caps which are attached to the distal or plus ends of the microtubules.