DNAAF2 and primary ciliary dyskinesia: Therefore, we studied the fertility status of male PCD individuals carrying mutations in DNAAF2, DNAAF4, DNAAF6, DNAAF7, CFAP300 and LRRC6 and systematically compared the composition of ODA and IDA components in sperm flagella and respiratory cilia by high-resolution immunofluorescence and transmission electron microscopy.