NAA10 and Hydrocephalus: Out of all mice that were generated in the above and other matings, hydrocephaly did develop in the Naa10 Δ668 male mice (23/62, or 37%) and in the Naa10 Δ668–674 male mice (16/45, or 36%), which is similar to the previously reported rate around 40% [21] and substantially higher than the rate of 1% in wild type mice on the C57BL/6J genetic background.