part of part of axonemal microtubule axonemal doublet microtubule A axonemal microtubule cellular_component A complete microtubule with 13 protofilaments that fuses with an incomplete microtubule called B tubule (containing 10 protofilaments only) to form an axonemal outer doublet. Inner and outer dynein arms, as well as the radial spoke, are attached to the A tubule. GO:0097649 A tubule 2014-09-10T20:41:28Z Ascomycota