Cells need access to sulfur sources in their environment to survive, for example sulfate. To import sulfate, YfbS, a sulfate importer that contains two TrkA_C domains, is utilized. The function of these domains is unknown, but it is hypothesized that they serve as a plug to control sulfate import. This poster aims to show the TrkA_C domains are conserved across the Vibrionaceae family, while using V. fischeri to determine their function in future research.