Sphingosine kinase activity is not required for tumor cell viability. oleh Karen Rex, Shawn Jeffries, Matthew L Brown, Timothy Carlson, Angela Coxon, Flordeliza Fajardo, Brendon Frank, Darin Gustin, Alexander Kamb, Paul D Kassner, Shyun Li, Yihong Li, Kurt Morgenstern, Matthew Plant, Kim Quon, Astrid Ruefli-Brasse, Joanna Schmidt, Elissa Swearingen, Nigel Walker, Zhulun Wang, J E Vivienne Watson, Dineli Wickramasinghe, Mariwil Wong, Guifen Xu, Holger Wesche