SSCP screening of the entire coding region of DNAI1 was performed in patients from 108 PCD families; systematic search for mutations was not executed in twenty-one families where the segregation of the SNP haplotype was inconsistent with that of the disease, as well as in twenty-eight families where mutations were identified in other PCD-related genes [EZ, unpublished data]. The gene discussed is DNAI1; the disease is primary ciliary dyskinesia.