SPAG1 and primary ciliary dyskinesia: To achieve the statistical power, we added data for 18 Caucasians reported earlier1,2 (8 compound heterozygotes carrying the large deletion), and for 25 SPAG1-PCD German patients (6 c.2014C>T homozygotes and 19 heterozygotes for c.2014C>T and the large deletion; Heymut Omran, personal communication).