As part of MIA, a complex associated with the outer doublet microtubules of the axoneme, may play a role in ciliary/flagellar motility by regulating the assembly and the activity of inner dynein arm. Interacts with FAP100; form the modifier of inner arm (MIA) complex. Localizes to the outer doublet microtubules of the axoneme. The mia2 mutants do not express the protein in the axoneme and display slightly jerky, slow swimming phenotypes, reduced flagellar beat frequencies and defective phototaxis. Belongs to the CFAP73 family.