SPAG6 and primary ciliary dyskinesia: These include orthologues of proteins linked to primary ciliary dyskinesia (DNAH5, DNAH11, RSPH4 and DNAI1)11; male infertility (PF16, PACRGA, CFAP43 and CMF7/TbCFAP44)7,10; and cone-rod dystrophies, as well as other ocular defects (CMF17, CMF39 and CMF46)8.