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E. coli chemotaxis core signalling unit, illustration
Illustration of the core signalling unit (CSU) from the bacterium Escherichia coli. The CSU is a transmembrane complex of proteins that detects chemical gradients in the bacterium's environment. The bacterium may then move towards the chemical if it can be used as an energy source, or away from it if it is toxic., by FRANCISCO J. ENGUITA/SCIENCE PHOTO LIBRARY
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