The maternally expressed Drosophila melanogaster DEAD-box helicase Vasa (Vas) is necessary for many cellular and developmental processes. including specification of primordial germ cells (pole cells). posterior patterning of the embryo. piRNA-mediated repression of transposon-encoded mRNAs. https://www.roneverhart.com/Medline-Guardian-Toilet-Safety-Frame-Fall-Prevention-Toilet-Rails/