DNAAF6 and Hydrocephalus: Knockout mice lacking the exclusively testis-expressed intronless mouse chromosome 1 pseudogene (that has been termed Pih1d3, 4930521A18Rik) have immotile sperm flagella with dynein arm defects and male sterility, but notably do not manifest situs inversus, respiratory cilia dysfunction, hydrocephalus or any ciliary phenotypes typical of PCD30.