Trimers of Dimers (IMAGE) California Institute of Technology Caption This is a model of the hexagonal arrangement of the chemoreceptors in what are known as "trimers of dimers." Credit Molecular Microbiology/Ariane Briegel, Caltech Usage Restrictions With credit as given above License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.