Figure 3: A) Subtomographic averages of microtubules 1-9 based on 9 cross sections from a patient with a confirmed IDA defect showing complete absence of IDAs on doublets 2,3+7, partial IDAs in doublets 4,9+1 and arms present in doublets 5,6+8. B) A montage of slices from a subtomographic volume of microtubule doublet 2 demonstrating the absence of IDA structure throughout the section.