Chemotactic-signal transducers respond to changes in the concentration of attractants and repellents in the environment, transduce a signal from the outside to the inside of the cell, and facilitate sensory adaptation through the variation of the level of methylation. Attractants increase the level of methylation while repellents decrease the level of methylation. Localized at the flagellum-bearing pole of the swarmer cell. Belongs to the methyl-accepting chemotaxis (MCP) protein family.