Balczerski B, Matsutani M, Castillo P, Osborne N, Stainier DYR, Crump G. Analysis of sphingosine-1-phosphate signaling mutants reveals endodermal requirements for the growth but not dorsoventral patterning of jaw skeletal precursors. Dev Biol. 2012;362(2):230-41. doi:10.1016/j.ydbio.2011.12.010