Testis-specific products of the Drosophila melanogaster sbr gene, encoding nuclear export factor 1, are necessary for male fertility.
Ginanova V, Golubkova E, Kliver S, Bychkova E, Markoska K, Ivankova N, Tretyakova I, Evgen'ev M, Mamon L. Gene. 2016 Feb 15; 577(2):153-60. Epub 2015 Nov 24.